data mine 2D state from gcregs.h

state map for DE engine should now be complete
shorten state names, figure out some bits

- envytools: add more convenient VIVS_FE_VERTEX_ELEMENT_CONFIG_START(0xc) syntax
  iso having to write (0xc << VIVS_FE_VERTEX_ELEMENT_CONFIG_START__SHIFT)
- figure out rs/depth tiling bits, PS bypass, write depth only
figure out MSAA bits