New features

• Added GetTimedEvents, GetNotes and GetChords extension methods for IEnumerable.
• Added IsEmpty extension method for MidiFile.
• Added GetDuration extension method for MidiFile.
• Removed NoteStopPolicy property from Playback.
• Added InterruptNotesOnStop property to Playback.
• Added TrackNotes property to Playback.
• Added NotesPlaybackStarted/NotesPlaybackFinished events to Playback.
• Added Playback constructor with IEnumerable as an argument.
• Added SetTime extension method for TimedEvent.
• Added SetTimeAndLength extension method for Note and Chord.
• Added channel parameter to methods to get program change events by GM programs and to methods to get control change events.
• Added GetPlayback/Play extension methods for IEnumerable and IEnumerable.
• Added setter to OutputDevice property of Playback.
• Implemented parsing metric time spans in 'h m s ms' format (for example, 3h5m56s897ms).
• Added BarBeatTimeSpan constructor that takes bars number only.
• Added Notes class that holds all available Notes.
• Added SkipPart and TakePart extension methods for MidiFile.
• Implemented snapping features for Playback.
• Added EndTimeAs extension method for ILengthedObject.

Small changes and bug fixes

• Implemented IConvertible on FourBitNumber and SevenBitNumber.
• Moved IGrid along with its implementations from Tools namespace to Smf.Interaction.
• Fixed: channel not set on program change events in Pattern.
• Fixed: last part of MidiFile is lost when splitting file with ArbitraryGrid.
• Fixed: sameTimeEventsComparison is ignored when managing timed events.
• Fixed: non-note events are not preceding note ones on exporting Pattern to TrackChunk.
• Fixed: quantizing with musical distance calculation type is failed.
• Fixed: musical time spans comparison can lead to long overflow.