Allow adding items to be disabled for list widget (#1102)

Author: gazebosx3

.all-contributorsrc

@@ -806,6 +806,15 @@
       "contributions": [
         "design"
       ]
+    },
+    {
+      "login": "gazebosx3",
+      "name": "Sam",
+      "avatar_url": "https://avatars3.githubusercontent.com/u/27162255?v=4",
+      "profile": "https://github.com/gazebosx3",
+      "contributions": [
+        "code"
+      ]
     }
   ]
 }

README.md

@@ -1,5 +1,5 @@
 # Netlify CMS
-[![All Contributors](https://img.shields.io/badge/all_contributors-93-orange.svg)](#contributors)
+[![All Contributors](https://img.shields.io/badge/all_contributors-94-orange.svg)](#contributors)
 [![Open Source Helpers](https://www.codetriage.com/netlify/netlify-cms/badges/users.svg)](https://www.codetriage.com/netlify/netlify-cms)
 [![](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/netlify/netlifycms)
 
@@ -63,7 +63,7 @@ Thanks goes to these wonderful people ([emoji key](https://github.com/kentcdodds
 | [<img src="https://avatars1.githubusercontent.com/u/3818?v=4" width="100px;"/><br /><sub><b>Edward Betts</b></sub>](http://edwardbetts.com/)<br />[📖](https://github.com/netlify/netlify-cms/commits?author=EdwardBetts "Documentation") | [<img src="https://avatars1.githubusercontent.com/u/8771435?v=4" width="100px;"/><br /><sub><b>Josh Hardman</b></sub>](https://github.com/jhardman0830)<br />[📖](https://github.com/netlify/netlify-cms/commits?author=jhardman0830 "Documentation") | [<img src="https://avatars0.githubusercontent.com/u/11616378?v=4" width="100px;"/><br /><sub><b>Mantas</b></sub>](https://behance.net/mistermantas)<br />[📖](https://github.com/netlify/netlify-cms/commits?author=mistermantas "Documentation") | [<img src="https://avatars0.githubusercontent.com/u/5244986?v=4" width="100px;"/><br /><sub><b>Marco Biedermann</b></sub>](https://www.marcobiedermann.com)<br />[📖](https://github.com/netlify/netlify-cms/commits?author=marcobiedermann "Documentation") | [<img src="https://avatars0.githubusercontent.com/u/7525670?v=4" width="100px;"/><br /><sub><b>Max Stoiber</b></sub>](https://mxstbr.blog/newsletter)<br />[📖](https://github.com/netlify/netlify-cms/commits?author=mxstbr "Documentation") | [<img src="https://avatars0.githubusercontent.com/u/89368?v=4" width="100px;"/><br /><sub><b>Vyacheslav Matyukhin</b></sub>](http://berekuk.ru)<br />[📖](https://github.com/netlify/netlify-cms/commits?author=berekuk "Documentation") | [<img src="https://avatars1.githubusercontent.com/u/9059048?v=4" width="100px;"/><br /><sub><b>jimmaaay</b></sub>](https://jimmythompson.me)<br />[💻](https://github.com/netlify/netlify-cms/commits?author=jimmaaay "Code") |
 | [<img src="https://avatars3.githubusercontent.com/u/802086?v=4" width="100px;"/><br /><sub><b>Luís Miguel</b></sub>](https://github.com/Quicksaver)<br />[🐛](https://github.com/netlify/netlify-cms/issues?q=author%3AQuicksaver "Bug reports") [💻](https://github.com/netlify/netlify-cms/commits?author=Quicksaver "Code") | [<img src="https://avatars2.githubusercontent.com/u/357379?v=4" width="100px;"/><br /><sub><b>Chris Swithinbank</b></sub>](http://chrisswithinbank.net/)<br />[📖](https://github.com/netlify/netlify-cms/commits?author=delucis "Documentation") | [<img src="https://avatars3.githubusercontent.com/u/1262221?v=4" width="100px;"/><br /><sub><b>remmah</b></sub>](https://github.com/remmah)<br />[📖](https://github.com/netlify/netlify-cms/commits?author=remmah "Documentation") | [<img src="https://avatars2.githubusercontent.com/u/29388?v=4" width="100px;"/><br /><sub><b>Sumeet Jain</b></sub>](http://sumeetjain.com)<br />[📖](https://github.com/netlify/netlify-cms/commits?author=sumeetjain "Documentation") | [<img src="https://avatars2.githubusercontent.com/u/26816046?v=4" width="100px;"/><br /><sub><b>Sagar Khatri</b></sub>](https://github.com/ragasirtahk)<br />[📖](https://github.com/netlify/netlify-cms/commits?author=ragasirtahk "Documentation") [💡](#example-ragasirtahk "Examples") | [<img src="https://avatars0.githubusercontent.com/u/8182932?v=4" width="100px;"/><br /><sub><b>Kevin Doocey</b></sub>](https://www.dooceykev.in)<br />[💻](https://github.com/netlify/netlify-cms/commits?author=Doocey "Code") | [<img src="https://avatars0.githubusercontent.com/u/31023010?v=4" width="100px;"/><br /><sub><b>Swieckowski</b></sub>](https://www.linkedin.com/in/arthur-swieckowski/)<br />[💻](https://github.com/netlify/netlify-cms/commits?author=Swieckowski "Code") [📖](https://github.com/netlify/netlify-cms/commits?author=Swieckowski "Documentation") [⚠️](https://github.com/netlify/netlify-cms/commits?author=Swieckowski "Tests") |
 | [<img src="https://avatars2.githubusercontent.com/u/283419?v=4" width="100px;"/><br /><sub><b>Tim Carry</b></sub>](http://www.pixelastic.com/)<br />[💻](https://github.com/netlify/netlify-cms/commits?author=pixelastic "Code") [🎨](#design-pixelastic "Design") [📖](https://github.com/netlify/netlify-cms/commits?author=pixelastic "Documentation") | [<img src="https://avatars0.githubusercontent.com/u/30510616?v=4" width="100px;"/><br /><sub><b>Sol Park</b></sub>](https://github.com/solpark)<br />[💻](https://github.com/netlify/netlify-cms/commits?author=solpark "Code") | [<img src="https://avatars0.githubusercontent.com/u/29218846?v=4" width="100px;"/><br /><sub><b>Michael Romani</b></sub>](https://github.com/michaelromani)<br />[💻](https://github.com/netlify/netlify-cms/commits?author=michaelromani "Code") | [<img src="https://avatars1.githubusercontent.com/u/15175868?v=4" width="100px;"/><br /><sub><b>Xifeng Jin</b></sub>](http://linkedin/in/xifengjin88)<br />[🐛](https://github.com/netlify/netlify-cms/issues?q=author%3Axifengjin88 "Bug reports") [💻](https://github.com/netlify/netlify-cms/commits?author=xifengjin88 "Code") | [<img src="https://avatars1.githubusercontent.com/u/372831?v=4" width="100px;"/><br /><sub><b>Pedro Duarte</b></sub>](http://pedroduarte.me)<br />[🐛](https://github.com/netlify/netlify-cms/issues?q=author%3Apeduarte "Bug reports") [💻](https://github.com/netlify/netlify-cms/commits?author=peduarte "Code") [📖](https://github.com/netlify/netlify-cms/commits?author=peduarte "Documentation") | [<img src="https://avatars1.githubusercontent.com/u/6064830?v=4" width="100px;"/><br /><sub><b>Antonio Argote</b></sub>](http://antonioargote.com)<br />[🎨](#design-Strangehill "Design") | [<img src="https://avatars3.githubusercontent.com/u/1479451?v=4" width="100px;"/><br /><sub><b>Kristaps Taube</b></sub>](https://www.ktaube.com)<br />[💻](https://github.com/netlify/netlify-cms/commits?author=ktaube "Code") |
-| [<img src="https://avatars3.githubusercontent.com/u/26639499?v=4" width="100px;"/><br /><sub><b>David Ko</b></sub>](https://github.com/daveyko)<br />[💻](https://github.com/netlify/netlify-cms/commits?author=daveyko "Code") | [<img src="https://avatars3.githubusercontent.com/u/440562?v=4" width="100px;"/><br /><sub><b>Iñaki García</b></sub>](http://www.txorua.com)<br />[🎨](#design-igarbla "Design") |
+| [<img src="https://avatars3.githubusercontent.com/u/26639499?v=4" width="100px;"/><br /><sub><b>David Ko</b></sub>](https://github.com/daveyko)<br />[💻](https://github.com/netlify/netlify-cms/commits?author=daveyko "Code") | [<img src="https://avatars3.githubusercontent.com/u/440562?v=4" width="100px;"/><br /><sub><b>Iñaki García</b></sub>](http://www.txorua.com)<br />[🎨](#design-igarbla "Design") | [<img src="https://avatars3.githubusercontent.com/u/27162255?v=4" width="100px;"/><br /><sub><b>Sam</b></sub>](https://github.com/gazebosx3)<br />[💻](https://github.com/netlify/netlify-cms/commits?author=gazebosx3 "Code") |
 <!-- ALL-CONTRIBUTORS-LIST:END -->
 
 This project follows the [all-contributors](https://github.com/kentcdodds/all-contributors) specification. Contributions of any kind welcome!