Add VOB and Imposter rendering to improve FPS

[DarkGuardsman]

Rendering of a 3D model as an item is taking a bit of CPU. We can remove this problem by coverting it into a 2D object at run time or before.

[DarkGuardsman]

This might work http://gamedev.stackexchange.com/questions/49915/how-to-cache-a-large-object

http://playcontrol.net/ewing/jibberjabber/opengl_vertex_buffer_object.html

[DarkGuardsman]

Changed the model out in https://github.com/BuiltBrokenModding/ICBM/commit/b8dfd87ad88f4b2a188cce877a51f299bc2430f1 so this is low priority now. Still needs to be implemented on all 3D models to improve FPS handling. As well an option needs to be added to enable and disable this feature. That way low memory machines will not be impacted.