nva/python: add a way to install the nvapy lib
vp3: Add a lot of unk regs.
envydis: vp2 -> xtensa, fuc -> falcon.
hwdocs: fµc -> falcon.
envydis: Undocument deprecated ISA selection.
envydis: Use new ISA names in documentation.
envydis/falcon: Remove stray documentation comment redundant with hwdocs.
rnndb: fµc -> falcon
pvcomp: Fix variants.
rnndb: Add PVENC and PUNK1C3.
Fix a few more references to FUC.
vp3 PBSP -> PVLD
vp3 PVP -> PVDEC
BSP -> VLD
PVP -> PVP1/PVP2
PCRYPT -> PCRYPT2/PCRYPT3
rnndb: Create graph/ and vdec/  subdirectories.
rnndb: Split vdec/ to further subdirectories.
Nuke nv_struct.xml
rnndb: More subdirectories.