Stip out old gamemode code
WIP editor rewrite
Using a new brush system
New wireframe shader for brushes
https://files.facepunch.com/ziks/2023-02-28/sbox-dev_YmLTpr5SVj.png
Property editor for selected brush
Compiling / saving CsgAsset
Basic context menu duplicate / delete
Testing out immediate mode stuff
Working on box scale gizmos
Scaling gizmo works for all axes
Scene -> Gizmo, scale gizmo tweaks
Smarter invalidation of elements, visual tweaks
Set default camera transform