Extra color formats.
Added a GPU color format override parameter to TextureParams. Not yet used.
Added a function to get a lower-bit-depth version of a color format.
Texture format overriding now works.
Lower bit depth format now supported by sprite pages.
Minor style fix.
Demo now uses the lower bit depth format.
Map fixes for the lower bit depth format.
D:GameVFS: files outside the VFS.
Prerenderer no longer uses the VFS for texture files.