- [x] Don't have the viewport window be scrollable
- [x] Object rotation with left click + mouse movement (very rudimentary implementation, but works)
- [x] Camera movement with shift + left click + mouse movement
- [x] Ability to change active model
- [x] Hide inactive models
- [x] Scroll zoom
- [x] (BUG) Fix some meshes not rotating around their origin point (in actuality, they don't have an origin point and are only rotating around 0.0, 0.0, 0.0)
- First thing that comes to mind is just rotating them around the center_point of the mesh (which is the bounding box's center point)