EditorBeatmapSkin
Addresses https://github.com/ppy/osu/discussions/27316. Stable lies about the first combo colour being first; in the `.osu` file it is actually second. It does a thing in editor itself to correct for this. https://github.com/peppy/osu-stable-reference/blob/master/osu!/GameModes/Edit/Forms/SongSetup.cs#L233-L234
ISkinComponent
ISkinLookup
private
readonly