List-like arrow for MIDI import operations
update windows build to Qt 5.1.1
add missing dll on windows
more fixes for spanners & import
Merge pull request #454 from trig-ger/midi_arrow

List-like arrow for MIDI import operations
fix measure search when instrument is hidden
fix #22451: MuseScore should make it impossible to load styles made in previous version
create beams in MusicXML import even if stem direction is not explicit
When, for a change in the cross-measure value setting, notes change from stemmed to stemless (or vice versa), stems are not properly removed or added.