Renamed fixie_es[_ext].cpp to fixie_gl_es[_ext].cpp
Created a viewport state.
Refactored the scissor state into it's own type.
rectangle and and range now hide their members.
Added color buffer state tracking.
Implemented glAlphaFunc*.
Split depth_stencil_state into two objects.
Merged the clear state into the other buffer states.
Implemented glDepthFunc.
Implemented glDepthMask.
Implemented glStencilMask.
Implemented glStencilFunc.
Implemented glShadeModel.