Remove TestCaseGamefield
Move seeking logic into a custom editor clock
Add xmldoc to some high-level classes to explain their separation
Fix OAuth token not saving often enough
Beatmap track shouldn't be start/stopped anyway - the IAdjustableClock should be DI'd in to perform the functionality.
Resolves #2380
Fix regression causing hard crash
Regressed in #2373. My bad.
Fix all possible cases of crossthread import data races
Prereqs: - [ ] ppy/osu-framework#1505
Unused. Unneeded. We already have TestCaseAllPlayers and individual tests in all rulesets. Eventually we probably also want osu.Game.Tests to not reference ruleset projects anyway.
Create ManualInputManagerTestCase
Update AssemblyInfo in line with framework changes
Rewrite editor selections to better handle selection and movement logic