Envshot and cubemap to skymap transforms

I created all the functionality to convert cubemaps (env maps) to skymaps and viceversa as well as modifying "take screenshot" to be able to play with TGA files, as well as PNG. I've recuperated the envshot functionality from vanilla doom3. now you can capture cubemaps from the game as well as convert the cubemaps to skymaps. (cubemeaps, or envmaps are a group of 6 textures: _px _py _pz _nx _ny _nz TGA textures while skymaps are the same group of textures rotate and flipped as well as using a different naming convention: _forward, _back, _left, _right, _up, _down)