Allow themes to be provided as a text file (launch option?)

[SapiensAnatis]

I'm currently making a few changes to the default theme and it's kind of irritating how I have to recompile the entire project just to see how a slightly different colour looks (which takes around 50 seconds for me).

It would be nice if I could instead work in a text file and just restart the bar with that as an argument.

I understand if parsing the text file to implement a Theme object could be a lot of work, then this may not be worth it.

[svmnotn]

@SapiensAnatis you can override themes in your config file.
Take a look at example-theme.toml and it's icon counterpart to see how to do it.

However I wouldn't be entirely opposed to allowing the string to be parsed as the location of a file to be loaded, perhaps relative to the location of the config.toml file.
That it would then just use the default theme and treat the file as an override, or just use the file as an unnamed theme as I think the system doesn't actually have an issue with that, but @pitkley would know more about that one.