fix warnings
german translation update
#9181: fix crash trying to resume node editing

Clears temporal objects to avoid crash trying to resume node editing and
disconnects signals to avoid repetitive connects
[relations] No crash when clicking remove with no selection
Fix #9224
[relations] Fix autogenerated feature forms
Fix bugs in dxf symbology export
phonon needs backends
Dxf: another small improvement in symbology export
Dxf: store export map extent option
Merge pull request #1024 from ahuarte47/Issue_9181

Bug #9181: fix crash trying to resume node editing
Better conversion of QPainterPath to dxf
Improve dxf export for svg symbols
Remove legacy code
Remove drawEllipse from dxf paint engine (default implementation calls drawPolygon)
Export more simple markers to dxf
Fix circle position in dxf export
[TRANSUP] no by James

Signed-off-by: Werner Macho <werner.macho@gmail.com>