rsx: Surface cache improvements

[kd-11]

Fixes a bunch of problems identified while looking into surface leak bug in Madden17. This doesn't contain all the fixes, but it introduces a subset of the patches that should be relatively safe:

• Ignore blit to self commands. This seems to be a game bug, but I found it to be very unusual.
• Separate transfer memory access into transfer_read and transfer_write. Writing has different coherency requirements than reading. This has consequences for performance and correctness at this stage.
• Add some vulkan convenience features. Adds label insertion to renderdoc compatibility mode. Very convenient when tracing large files. Also allows vulkan present without waiting for this same purpose. Not directly useful to users but reduces iteration time when debugging complex bugs.