Merge pull request #313 from lvinken/20581-capx-impl-2

Initial mtest support fro Capella
add license header to fastlog.h
fix #17673: arpeggio playback
fix arpeggio default height
fix #17521: Replacing arpeggio and undo removes it completely
add ability to change arpeggio by drag/drop/dbl click
Enabled more Capella testcases