Rectangle: Format fix
Mesh: ClearBuffers returns BGE_FAILURE if no buffers allcoated
Mesh: CreateBuffers log messages
Fix compile issues with shapes.

When this gets merged into develop-0.2.0, it will be re-patched.
Merge branch 'develop-0.1.x' into develop-0.2.0
Re-patch of recent, incompatible upstream fix

Shape::NumTriangles->NumIndices