use MusicXML formatting for first page header
header and footer fixes
fix #39421: fix selection detection of break plugin

similar to earlier fixes for colornotes (606b401) and notenames
(df6e8a0)
Merge pull request #1461 from Jojo-Schmitz/break-every-x-measures

fix #39421: fix selection detection of break plugin
fix double dialogs when error for login, fix modal message dialog
Merge pull request #1459 from lvinken/musicxml-font-handling

Musicxml font handling
do not init workspace if no UI