Improve node creation menu and categorization

[Ezbaze]

• Fix the clickability area of categories in the node editor context menu to close Category text label isn't clickable in the Node Graph editor context menu #2718
• Node editor context menu nodes category swaps:
  1. Circular Repeat: Vector → Instancing
  2. Copy to Points: Vector → Instancing
  3. Repeat: Vector → Instancing
  4. Switch: Text → Math: Logic
• Organize code for certain nodes across files to reflect their new categories

Also resolves https://discordapp.com/channels/731730685944922173/881073965047636018/1383884104566706217 and https://discordapp.com/channels/731730685944922173/881073965047636018/1384323535316713542

[Keavon]

I have force pushed this branch to move it to a new base. Ensure you have the branch checked out. Then run git stash on any local changes (and ask me before following these steps if you have any un-pushed commits on your local machine). Then fetch this branch and git reset --hard origin/node-editor-context-menu. And finally git stash pop your stashed local changes, if you stashed them.

[Firestar99]

I'd love to get this merged before I'm rearranging all the vector code and nodes into separate crates :D

[Keavon]

@Firestar99 these are easy to replay on the latest master branch in the future, so no need to let this block you. When you're moving the node implementations around, feel free to reference this issue for how some of them got recategorized.