- Added bswap for 64 bits.
- Improved and better unified OpenGL and OpenGL ES2 texture interface (support for compressed textures in OpenGL ES2).
- Added support for PVRTC and PVRTC2 compressed textures format.
- Minor improved in DDS loader.
- Initial support for PVR loader (currently with limited image formats support - PVRTC, PVRTC2, DXTn). This loader will improve soon.

IMPORTANT: This commit doesn't provide integration of PVR loader with iOS, MacOSX and some Windows IDEs project files.


git-svn-id: http://svn.code.sf.net/p/irrlicht/code/branches/ogl-es/@4529 dfc29bdd-3216-0410-991c-e03cc46cb475