TestSceneManiaPlayer
To test upscroll easier, and with all parts in conjunction. `ManiaSkinnableTestScene`s already had the capability to switch directions, but they did not show all parts together, which meant regressions were missed.
# Conflicts: # osu.Game.Rulesets.Catch.Tests/TestSceneBananaShower.cs # osu.Game.Rulesets.Catch.Tests/TestSceneHyperDash.cs # osu.Game/Tests/Visual/ModTestScene.cs # osu.Game/Tests/Visual/OsuTestScene.cs
Also makes `CreatePlayerRuleset()` and `CreateRulesetForSkinProvider()` not-null to avoid unwanted behaviour with their derivers
PlayerTestScene
CreateRuleset