Quick 'n' dirty concept for sidebar priority display.
Added example of icon for global priorities.
Hide priorities in sidebar when not in edit mode.
Added transition for sidebar item mode switching.
Added tooltip for global priority star.
Sidebar priorities display made conditional.

Stars only show for global priorities, and values only show for non-zero priorities.
Fixed sidebar item drag 'n' drop value.
Don't use ink effect in plugin menus, it gets stuck.
Fixed user-set priorities always made global.
Merge remote-tracking branch 'origin/priority-display' into dev