fix #28356: add MuseJazz as a musical text font
remove code duplication in InstrumentsDialog and NewWizard
Refactoring and improving playback on GPX format - improvements to importing percussion still need to be made (drumset)
Support for ties, grace notes and some articulations in Guitar Pro 6, Guitar Pro implementation split up.
Added support for double bars in Guitar Pro 6
Support for trills, crescendos and diminuendos in the Guitar Pro 6 format
Support for Guitar Pro 6 tremolos
Added support for GP6 wah open and wah close
Support for dynamics, accents, turns, mordens and pick directions in Guitar Pro
Fingering supported in GP4, GP5 and GP6
Support for arpeggios, voltas, brush markings, grace notes (on and before beat) and repeat markings
Added palm mute text
Support for let ring marking in GP4/5/6
Support for tapping, slapping, popping, barre, timer and text markings
Support for artificial harmonics in Guitar Pro 6
Added support for parenthesised notes in Guitar Pro 6
Support for rasgueado marking in GP6
Support for ottava markings
Updated drumset representation
Edited representation of natural harmonics