Vardefunc

**Changelog**

Additions:
* Add a DebugOutput class (Example in /examples)
* More enum helpers
* `finalise_output` and `initialise_input` decorator

Updates:
* All debanders are deprecated in favor of vsdebandshit
* `vardefunc.placebo.shader` is now at `vardefunc.scale.placebo_shader`
* Add an argument to remove duplicated ranges in `normalise_ranges`

Deletions:
* `generate_keyframes` is removed

**Changelog**

Additions:
* `MinMax` edge detect mask and `detail_mask` until vsmask is completed
* `aa` module until lvsfunc one is rewritten
* more utility functions in `util`. Most of them are borrowed from lvsfunc with some changes.

Updates:
* F3kdb now needs a `SampleMode` for the `sample_mode` argument.
* neo_f3kdb no longer has leaking memory or removes FrameProps.
* `placebo.deband` now allows RGB clip

**Changelog**

Additions:
* `py.typed` file.

Updates:
* Various docstring
* Fix a bug in `vardefunc.deband.f3kbilateral` where a threshold would be negative.
* Fix a bug in `vardefunc.scale.fsrcnnx_upscale` where `upscaled_smooth` depth would be wrong.
* Thresholds are now displayed on the frames themselves in `vardefunc.noise.Graigasm` when `show_masks=True`

Python 3.9 is now required.