Eighth basic quantization value for human-performed files
Add test for human performance 4/4
Prepare human beat functions
Add Beatroot code by Simon Dixon for beat detection in MIDI files

1. Passing of objects by values into functions
   were replaced by passing them by reference, where it is worth it.
2. Code style was reformatted according to the MuseScore style

Reformat Beatroot code style

Conflicts:
	mscore/CMakeLists.txt
	mtest/CMakeLists.txt
Fix fillBeats function (Beatroot): no interpolation between 1st and 2nd beats
Make the scope of local variable more narrow (Beatroot)
Integrate Beatroot (beat detection) algorithm into MIDI import
Don't remove short notes after quantization, adjust them instead
Notation simplification functionality for MIDI import
Add option for number of rests minimization
Switch off notation simplification for tests
More strict check for range end (DP quantization)
Fix off time simplification
Don't print in simplify if rests remain (toDurationList function)
Don't simplify durations with the too small profit
Fix staccato for tuplet note off times
Add tests for note off times simplification
Fix note off time simplification
Voice separation to improve score readability
Rename 'Minimize number of rests' option to 'Simplify notation'