Random song when entering the select screen without a beatmap selected
Made MetadataSection's Text setter load the text asynchronously
Fix osu!mania autoplay generation
Implement PerformanceCalculator for osu! to calculate PP
Fix mania replays not defining important frames
Load Player-based TestCases asynchronously
Also removes the other rulesets' HitObjectComposers for now.
Resolves https://github.com/ppy/osu/issues/1495 .
Hide inspectcode output from appveyor console
Vertically centre the panels in osu!direct
Catcher absolute sizing improvements