Move PauseOverlay to correct namespace.
Also only shows sets with beatmaps for current play mode.
# Conflicts: # osu.Desktop.VisualTests/osu.Desktop.VisualTests.csproj # osu.Game/Screens/Select/PlaySongSelect.cs # osu.Game/osu.Game.csproj
# Conflicts: # osu.Desktop.VisualTests/osu.Desktop.VisualTests.csproj # osu.Game/Overlays/Pause/PauseProgressBar.cs # osu.Game/Overlays/Pause/PauseProgressGraph.cs # osu.Game/osu.Game.csproj
# Conflicts: # osu-framework # osu.Game/Beatmaps/Drawables/BeatmapGroup.cs
References now use the Create*-names instead of the outdated Get*-names to create instances of FlowStrategies.