Remove Unused Palettes

Hi, I would love to ask for a feature that allows me to remove unused palettes.
- Having an option to choose if I want to remove all unsed palettes or just unused Position palettes, Color palettes, etc.
- Having the option to remove unused channels from all palettes or just Position palettes, Color palettes, etc.
This will save me lots of time in tidying the showfile after the show is plotted. :D
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