Editor : Enhancments and Features addition

[sdinesh86]

Editor Enhancments

Creating this thread to track implementations for the editor enhancments and features like Material Browser.

• TabbedPanel UI Element Editor: Initial implementation of TabbedPanel element #17465.
• Listbox UI Element. Editor: Added Listbox element #17490
• MaterialBrowser Panel in project panel with menu to Create, And Apply Material and store it in the editor. Editor : Basic Material browser implementation #17556
• Open the Selected Material ( in MaterialBrowser ) in Properties editor.
• Replace the current History panel with the Listbox Element.
• Refactor Outliner to create a generic simple treeview.
• Replace the current Outliner for Scene Panel with the new one.
• Cleanup.

Now that we are implementing this i propose to refactor the Add* commands to not apply a default material while creating objects and adding to the scene.

[Mugen87]

Related #16234