Populate Editor Toolbar

[ssell]

The editor has a toolbar that is currently unused (other than the testo button ...), which can now be put to use. The following buttons should be added even if all functionality is not yet available:

• Toggle translation gizmo
• Toggle rotation gizmo
• Toggle scaling gizmo
• Display bounding boxes
• Display world axis
• Display world grid
• Enable/disable lighting

Icons will need to be created for each.