fix #21838 fix #21910
Add loop playback feature
initial hooks
implementation of next/prev track

move up and down by track, stopping only at tracks that have content at
or before the cursor position within the current measure
change alt-up/down to move by chord and track

First move through current chord on current track, then move up and down
by track.
move empty inspector hint into tooltip
fix #22121
Inspector for generic element: make ranges for X and Y offsets wider.

For instance, while placing a text element within a full page frame, the current ranges are too strict, as for instance Y offset is limited to 10 sp max.
Merge pull request #431 from mgavioli/Inspector_element_wider_xy_offset_ranges

Inspector for generic element: make ranges for X and Y offsets wider.
fix for slurs and voices in MusicXML import
fix #18345: Disable copy paste between different versions of MuseScore
Image inspector has some issues:

*) When autoscale is turned on, size and scale values are not updated neither are disabled
*) Lock aspect ratio does not work
*) mm/sp size check box does not update size values not size units of measure

Fixed by:

1) Sync-ing the enum at the beginning of 	inspectorimage.cpp with iList items
2) Adding a few extra calls to InspectorBase::valueChanged() for commands which change two values at the same time
Merge pull request #433 from mgavioli/Fix_inspector_for_images

Fix inspector for images
Merge pull request #430 from lvinken/13108-bagpipe-palette

13108 bagpipe palette
Merge pull request #427 from vgstef/loopPlayback

Add loop playback feature
fix loop icon
Merge pull request #432 from MarcSabatella/kbd-mode

vertical keyboard navigation
bump end barline width to 0.5sp. See #22050
fix scale of dots in repeat barline for small staves
add show property to Part object in plugin framework