More work in Command Buffers...

More work in Command Buffers

I think/hope this is the last big CL for this.

*) Moved GAPIInterface enums to cmd_buffer_format.h

The reason is you should not have to include CODE 
to make data. The fact that the enums were in 
GAPIInterface, a class, meant you had to include
code if you wanted to make a command buffer.

*) Typed arguments where I could.

So for example Draw takes PrimitiveType instead of
uint32. CreateVertexBuffer takes a ResourceId

*) Renamed enums etc to match style guide.

*) Moved BitFields into specific commands

*) renamed arguments from id to type_id.

[rlp, 2009-09-25 22:43:30]

LGTM

I think moving the enums from gapi to cmd_buffer_format was a good idea. All of
these changes make the code much more readable and clear.