Update to instruments.xml

Added common genre tag to Acoustic Bass
Merge pull request #498 from ChurchOrganist/Instruments.xml-update

Update to instruments.xml
make plugin manager persistent
In French kbd, shortcut for adding a rest to TAB conflicts with shortcut for fret 4.

Fixed by changing the former to ';'
Merge pull request #500 from mgavioli/Fix_TAB_rest_shortcut_for_French_kbd

TAB shortcut conflicts in French kbd
Images inserted in scores behave as embedded, rather than as linked (as before).

I.e.: images keep the contents they had when inserted, ignoring modifications (or deletion) of the original source image.

Note: this applies only to .mscz files; images in .mscx files must to rely on the external source, as there is no resource actually included in the score.
Merge pull request #501 from mgavioli/Images_as_embedded

Truly embedded images (vs. linked)
Fix the crash when (copying/cutting and) pasting a single lyrics to a single note.
Merge pull request #502 from mgavioli/Single_lyrics_paste

Single lyrics paste
enable shortcuts in qml editor
fix shortcuts for plugins
use qt key bindings for qml editor
add reload button to pluginCreator
new test plugin: random score generator
expose LineBreakType to plugins
fix #23005: Entering number in Find causes crash in scores with multimeasure rests
bugfixes for plugins; new test plugin random2
fix #23047