Rewrite vsgenstubs4

[Setsugennoao]

As the title says, it's not a fix, i just rewrote everything since the stubs were outdated, and the actual module was missing features.

Files changelog:

• .gitignore: Mainly to ignore _pycache_\ files.

• setup.py: Added vsgenstubs4 command line action, copy .pyi (part) file when installing from pip.

• __init__.py, __main__.py: Added main so it's possible to do python -m vsgenstubs4, moved code from dunder init to init.

• init.py: Rewrote the module

  • Made the typing way easier to the user
  • Collapsed the docstrings, adding \n. With enough plugins it would've reached thousands of lines and VSCode would have stopped reading the pyi file; this edit is to try avoid this issue.
  • Moved plugins to load-plugin.
  • plugins (-p) is now for selecting only those plugins and if the stubs file already exists, append them.
  • Sort the plugins and functions alphabetically.
  • Added exclude-plugin, which as the name implies, excludes that plugin from the stubs file.
  • avs-plugin now will print a user friendly error if the avs plugin isn't available.
  • Added force command, which will force the rewrite of the file.

• _vapoursynth.part.pyi: Rewrote it from the ground up from the latest vs git (R60) cython code.

  • Added missing global members: FilterMode, CoreCreationFlags, FuncData, Function, Func, FramePtr, RawNode, RawFrame, ColorFamily.UNDEFINED
  • Added all missing class methods.
  • Removed methods and functions removed in R60.
  • Typing: added DataType, CallBack, _VapourSynthMapValue types.
  • Minimized Any usage, looking up the cython code paths.
  • Added inspection API under not TYPE_CHECKING so it's shadowed by type checkers and editors, since it's not public yet, but developers have it ready and can easily use it.
  • Added all__, pyxcapi_\
  • Exposed enum values stop shadowing their literal value (eg a function that takes Literal[vs.ColorFamily.YUV] in an overload, previously errored with vs.YUV)

This is still Python 3.8 compatible.

Tested with R59, R60 (latest git), both with ~200 plugins.

[cid-chan]

Setsu, the .pyi-file is there to document the public API of the vapoursynth module. It shouldn't describe every minute detail of the vapoursynth-module, especially internal classes a user will never see