Awsmfunc

Notes to come

- Corrected `zresize` bug when cropping.
- Added `add_hdr_measurement_props` to add frame props about the image's brightness.
- Improved `detect` module, and reworked progress output.
- Added `detect.run_scenechange_detect` to detect scene changes in a clip.
- Supports `av-scenechange`, `vapoursynth-{wwxd,scxvid}` and `mvtools`.
- Added `detect.measure_hdr10_content_light_level` to measure and output HDR10/ST2086 metadata for the clip.

- Improved `DynamicTonemap` params for `libplacebo`
- Added support for [vsfpng](https://github.com/Mikewando/vsfpng) in `ScreenGen`.
- Speeds up screenshot generating by up to 10x.