NV0x -> NVx.
NV* -> GK*, GM*
NV* -> GF*
NVA[358F] -> GT21x/MCP89
NVxx -> G8x/G9x/G200/MCP7x
NV50 -> G80
NV4x -> G7x, MCPxx, NV44A.
docs: Nuke classes.rst [redundant with the list in graph/intro]
Clean up obj classes.