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The _rgba versions are temporary until the state tracker is updated.
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Also, quite a bit of re-org of the tile caches and surface mapping/unmapping.
Leave surfaces mapped between primitives now.
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Instead of using read/write_quad() functions, do framebuffer accesses via
get/put_tile(). A cache of tiles is used to avoid frequent get/put() calls.
Only implemented for color buffers right now.
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Mainly down to the support for legacy TNL processing now.
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This removes the notion of multiple color buffers from all other stages.
Will need a bit more work when shaders with multiple render targets arrive.
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