Fix logo animation discrepancies

[peppy]

Resolves #2282.

[smoogipoo]

I'm a little bit sketched out by the buttonSystem.Alpha delay stuff, but let's see how many times we have to rewrite this before we recognise this entire thing is absurdly complex and teetering on the edge of unmaintainability.

[peppy]

Completely agree.

To make this manageable, each of the components with state changes needs to be split into its own drawable class, as we're doing everywhere else these days.