Fix #31176 - Appearing and disappearing courtesy clef

When courtesy clefs are turned off, some sequences of steps involving clef changes across system breaks result in spurious courtesy clefs being shown. Also, occasionally, the layout oscillates between showing / hiding courtesy clefs and/or fitting its measure in the same system or the next system. See http://musescore.org/en/node/31176 for details and examples.
fix #32116: [MusicXML] new-page on first measure shouldn't create one more page
fix #32356: Crash when pasting 'all' to new file
fix #31971: Staff names of hidden instruments appear
Merge pull request #1274 from mgavioli/Fix_31176_appearing_and_disappearing_courtesy_clef

Fix #31176 - Appearing and disappearing courtesy clef
Fix #32541 - Some artic. anchor not saved in style dlg

If some values are used for articulation anchors in the "Style | General" dlg box, they are not restored when opening the dlg again and presumably lost.

See http://musescore.org/en/node/32541 for details.
Merge pull request #1284 from mgavioli/Fix_32541_articulation_anchor_not_saved

Fix #32541 - Some artic. anchor not saved in style dlg
update Gonville, add GonvilleText

fallback to BravuraText
add vtests for Gonville