plugins: Allow plugins to customize their log colors

[uniboi]

If the color flag is 0 (expected but undocumented default behaviour of plugins for GetField) NS::Colors::PLUGIN is used as a default.

The Color is packed into a 64 bit integer like this

const Color = packed struct(u64) {
    red: u8,
    green: u8,
    blue: u8,
    _: u40 = 0,
};

The colors only occupy the lower 3 bytes of the integer. The remaining bits are ignored. When determining to use the default color or the provided log color, the lower 12 bits are checked if any is not 0.

Related: R2Northstar/NorthstarDiscordRPC#26

[catornot]

Were the plugin field and plugin string enums supposed to be non exhaustive?

[uniboi]

yes to allow adding more fields in the future they're supposed to be non exhaustive

[catornot]

Alright a few plugins crashing is fine for now ig
Will review this pr later today probably

[F1F7Y]

The above review wasnt supposed to be an approval smh

[catornot]

Looks good me thinks

also pretty colors for plugins :)

[GeckoEidechse]

Yeah so for some reason it renders as (almost?) black when the colour value is not set which looking at the code shouldn't be the case as it should just be default colour if not set

Screenshot is from when running the PR with DiscordRPC at v12, i.e. current

[uniboi]

Current rrplug builds return uninitialized values for colors. If a plugin returns 0 as color, a default will be used

[GeckoEidechse]

Confirmed working in testing together with R2Northstar/NorthstarDiscordRPC#26 :D

[GeckoEidechse]

cc @F1F7Y whether you wanna re-review, given that you requested changes. Otherwise if there's no response I'd merge within a day or two to not stall the PR o7

[F1F7Y]

Code looks acceptable