Renamed getOgreFBO() to getOgreFboId().
Cleaned up Ogre plugin loading.
Renamed rtt_texture to m_rttTexture.
Added unbinding of m_renderTexture on doneOgreContext().
Renamed m_renderTexture to m_renderTarget.
Added unbinding of additional GL buffers on doneOgreContext().

Added glPopClientAttrib() and glPushClientAttrib() to glPopAttrib() and glPushAttrib().
Added detaching of m_renderTarget on OgreNode destruction.