New features

New tools:
- notes merger to merge nearby notes;
- MIDI file splitter to split a MIDI file in different ways;
- CSV converter to convert MIDI objects to CSV representation and read them back.
ResizeNotes method to resize group of notes to the specified length treating all notes as single object.
GetNotesAndRests method to iterate through the specified collection of notes returning instances of Note and Rest where rests calculated using the specified policy.
OnObjectQuantizing method of the quantizer classes has now quantizedTime parameter of the QuantizedTime type which holds information about new time for an object (see Custom quantizing to learn more).
QuantizingLevel setting was added to quantizer settings which allows to specify how close an object should be moved to nearest grid time.

Minor changes

MakeNotes method was renamed to GetTimedEventsAndNotes.
Added Clone method to MidiFile and MidiChunk.
Added Divide method to MidiTimeSpan, MetricTimeSpan and MusicalTimeSpan which takes another time span of the same type to produce ratio between time spans.
Added ChangeDenominator method to MusicalTimeSpan which returns an instance of the MusicalTimeSpan that represents the same time span as original one but with the specified denominator.
Removed setters from ITimedObject.Time and ILengthedObject.Length properties (setters on implementations still exist).
Implemented IEnumerable<T> on ValueLine and removed Values property.