Broken build save
default values data members gl renderer clean up
Further update of the gl renderer - broken build
Several refactorings in the gl renderer
Added gl context in attempt to reduce merge conflicts
Merge branch 'dev_r65' of https://github.com/jdduke/three_cpp into dev_r65

Conflicts:
	three/renderers/gl_renderer.h
	three/renderers/impl/gl_renderer.cpp
Merge with SDL/GL update build fixes