Fix controls issues with rendering order and font bins
merge; update controls to use nodes instead of drawable lists
Fix compile error in Controls.cpp on iOS.
Merge branch 'topic-controls' of https://github.com/gwaldron/osgearth into topic-controls
Controls: fix shader generation.
Merge branch 'topic-controls' of https://github.com/gwaldron/osgearth into topic-controls
Merge branch 'master' into topic-controls
Fix: ShaderGenerator only needs VPs on leaf geoms; VP needs to build mains even in the absence of shader functions
Merge branch 'topic-controls' of https://github.com/gwaldron/osgearth into topic-controls
Optimization for ShaderGenerator (shared default state set)
Merge branch 'master' into topic-controls