Also brings some naming up-to-date.
Don't play sliderbar samples more than once when value has not changed.
Update exception name.
Add score statistic tracking (osu!).
Results screen
Add chat sending support.
# Conflicts: # osu.Game/Users/User.cs
General fixes
# Conflicts: # osu.Game/Rulesets/Replays/Replay.cs
Add a simulated key-up delay to auto replays
Fixes key counter display looking odd.