Blender Git Loki

This commit rearranges the rasterizer to use a strategy design pattern. The concrete strategies are various storage methods. Currently these are immediate mode, and vertex arrays. This will make it cleaner to add in the VBO support (rather than having it mixed in with the vertex array rasterizer).

In the process of changing the ListRasterizer to accommodate the changes to OpenGLRasterizer, a check for ATI cards no longer gets acted upon. This check may not have been necessary and would cause slow downs on ATI cards. Some testing will reveal if something needs to be added back in.