OpenGLHelper: extract BGRA buffer -> BitmepEx conversion

Change-Id: I71edb2768d24f0c6686a9c94333447a5acc498b4
OGFrameGrabber: use a BGRA buffer

Change-Id: Ie827ba98a6ff65d63eb61df1d90e18919de86395
OGLPlayer: no sound of OpenGL models

Change-Id: I50277f315689006e6a824e61a6ba6929077b20a8
OGLPlayer: use libgltf methods for playing 3D animation

By now this methods are unimplemented inside libgltf.

Change-Id: Ib7dfb1a053d11fc43fec26ec4f9195e7f64a8a74