Update readme.

Push version, fix readme, reduce default quality to 99.

Add dimming for HDR and subsampling. Update readme and push version.

* Add dimming for HDR and subsampling.
* Fix squarepx, update readme, push version.
* Add 2160p for exotic exports.

Fix --split, add ugly split mode.

Merge pull request #4 from cubicibo/MR/optimizepal

Optimise palette generation for PGS.

Compute TC to match mpv PTS of ASS events.

Add parameters to customize libimagequant behaviour.

Add --splitmargin argument to specify minimum VxH spacing to do a split.

cubicibo/MR/timegrid: Rewrite time handling to sample on frame grid

The time unit is now the frame count and FPS rather than the integer ms frame duration.

Fix excessive cropping when splitting is enabled.