pingo. Add creating index buffer from geometry file.
pingo. Add indexed geometry.
pingo. Fix cleanup of GLES index buffer.

Cleanup gl handle in GLES index buffer destructor.
Rmove redundant check that gl handle isn't null in GLES vertex buffer.
pingo. Add render geometry indexed - empty implementation for now.

Change render geometry constructor and destructor access to protected.
Add render geometry indexed - derived from render geometry. Only creation/destruction implemented for now.
Add convenience index buffer shared pointer type.
pingo. Complete implementation of render indexed geometry.

Implement render geometry indexed set state.
Implement render geometry indexed execute command.
Add index type to GLES index buffer.