inverted font rendering on y axis
more cosmetic changes in ui
even more cosmetic changes
redisable UI
added an autoexec file
added XXX comments
made the test ui state persistent
removed explicit GL dependencies
mostly fixed imgui
redeactivate UI
added quaternion class
started to add rotation node for CSG
Fixed instability issue in qef

Added quaternion in math and rotation support in csg

Identified another source of precision in the way we compute vertex position in
world space. Should be easy to fix though
fixed one more precision issue in DC