Cleaned up the renderer a bit
Two new OpenGL 1.0 renderers, hopefully they work on older hardware.
Merge branch 'feature/gl1'
Fix loading of dependant FGDs. Fixes #72.
Add numeric zoom hotkeys to 2D views. Fixes #71.
Stop the 'Hide unselected' feature from hiding the worldspawn. Fixes #65.
Prevent simple hotkeys from being captured by non-editor forms. Fixes #60.