Improve stability with many bugfixes

[jonko0493]

Just a grab bag of bugs fixed through testing.

• Fixes quite a few errors with the script preview, most notably how sprites entrances/exits are handled (matches what the game does better)
• Uses display name for BGM selector in the script editor
• Topic links would cause crashes when clicking them before, this fixes that
• Fixes a crash on macOS when renaming without a selected command
• Fixes Empty script sections get deleted on build/reload but labels for those sections persist #236 by now pruning the labels section on load, preventing an issue where scripts would have lots of extraneous section references
• The BG_DISPCG command was initialized with a TEX_BG before; this has been fixed
• Fixes Crash when attempting to replace BGM with an MP3 #243 where trying to replace a BGM with a file that needed AOT conversion caused crashes due to me doing a bad job copying them
• Some more character rename bugs were fixed
• Disable fields in the puzzle and character editors that can't currently be edited
• Fixes some errors with the Skip OP hack
• During investigation, I found that Docker does not work on macOS at all and requires elevation on Linux. I've updated the readme and disabled those options on macOS as a result
• We now allow loading projects even if your devkitARM installation is out of date bc that's fine as long as you're not trying to apply hacks
• Added melonDS snap location as a preset on Linux
• Fixed some underlying issues with NitroPacker
• Fixed a crash related to BG_DISP being set to NONE and prevented the user from selecting none for BG_DISP and BG_DISPCG

[WiIIiam278]

Rolling with this at the moment and it's working great, much more smooth. Nothing immediately jumps out