change to messagebar some messageboxes in mainapp
dxf improvements:
* save/restore dxf export dialog geometry
* reduce debugging noise
* output dxf in windows-1252 encoding
* fix label layer assignment
indentation update
german translation update
Followup to da3516c; find custom prefix QScintilla include directories
Follow up 27abd208
Fix #10747 - Don't force multi type on point features

Ref #10672 - Commited fix to force multitypes on shapefiles
Don't crash with no attribute set in graduated renderer
Use a single format string using Qt format for renderer label