This PR converts the leaderboard into a full-fledged skinnable component
that can be manipulated by users at will.
Notably, this finally allows https://github.com/ppy/osu/issues/20422 to
be fixed - although it's a very mixed bag, for several reasons:
- Because of taiko players' refusal to see reason^W^W^W^Winsistence on
keeping stable behaviours related to aspect ratio treatment, I have to
assume the worst case scenario, which means than on typical
resolutions like 16:9 (or even worse, 4:3), the leaderboard will
likely not occupy as much vertical space as it probably could.
- Additionally, there's the problem of where to put the spectator list.
I settled on putting it to the right of the leaderboard, but that's
kind of janky, because the leaderboard sometimes collapses and
sometimes fully hides, leading to a very awkward space left behind. If
we had the capability to anchor elements to other elements, maybe this
could be resolved, but for now, I'm not sure what to do. I think if
some users are bothered by it they can move it where they want it. Or
delete it.
It's all a bit weird so let's just disable it for now. For instance,
this is exposed as "text" font / colour but only affects the header.
Also, no other headers are cusotmisable in similar components.