Automatically parse palettes from user's terminal configs

[tombh]

This could be a parallel method to the screenshotter.

The idea is that we learn the locations and syntaxes for the various terminal emulators. For instance Alacritty keeps its palette definitions in $HOME/.config/alacritty/alacritty.toml under [colors.*].

It'll be a significant amount of work, both building and maintaining, but a lot more convenient for users.

Let's see how the screenshotting goes and how much desire there is for an alternative approach.

[tombh]

I've since found about OSC 4 terminal codes that request the terminal to return the RGB values for palette indexes. So with that and screenshotting we should be fine.