Initial setup of drag function
Basic dragging of text elements
ctrl-click jumps to definition or include file

as per issue #123
better figure mode hl
save svg wip
oops
finetune figbass
add some missing styles
allow rest, spacer, skip in figbass
better wording; fix #389
pot/nlpo
new toolbar buttons to browse back after a jump to definition
Improvement on variable handling
pot/nl.po
Revert "Improvement on variable handling"

This reverts commit 217eb4e9af3f90f23adb4360ed97391ba478ea64.
Improvement on variable handling
new default shortcuts:

open file or definition: Alt+Return
go back: Alt+Backspace
go forward: Alt+End
new strings already translated
More improvements on variable handling
set part name