Use float types for chat overlay height
Also inverts logic
# Conflicts: # osu.Game.Rulesets.Mania/UI/ManiaRulesetContainer.cs # osu.Game.Rulesets.Osu.Tests/TestCaseSlider.cs
Also cleans up some weird code
also OsuSetting to GameSetting
Limited to (relatively) sane values until we eventually get around to adjusting UI to allow higher extermities.
Also adjusts exponential scoring to be closer to stable. Log wasn't cutting it.