General fixes.
Better screen hierarchy
# Conflicts: # osu.Game/Beatmaps/Beatmap.cs
Fix beatmap import crash when the first timingPoint starts later than…
Design improvements
Fixed "Namespace does not correspond to file location".
Add slider ticks.
- Applies to Slider Ticks and start circle. repeat/endpoints still need addressing. - Removed SliderTicksLayer abstraction for now.
General HitObject improvements.