Fix alignment of unstyled text.

Separate out the offset from the text alignment, and use the
text alignment to set the bounding box.
Fix shape and initial position.
Merge pull request #312 from softins/unstyled-text

Fix alignment of unstyled text.
minor/typo fixes
update MusicXML website in about box
fix #20997 fix #19149
fix #15943: Tuplet creation from empty measures (whole rests)
change text in staff properties dialog
fix regression: position of instrument names
experiment new color and thickness for breaks and spacer to make them more discrete
rename icons according to FreeDesktop Icon Naming Specification
change icon set
add align-vertical-baseline icon, fix alignment icons in Style->Text
fix resource file for Mac OSX
replace more icons
replace more icons, take 2
fix #11684: replace 'Display' by 'View' in the main menu
Fix #21040: closing the Synth Control window with its own close button leaves the "View | Synth" menu item checked.

Fixed by connecting SynthControl::closeEvent() with the relevant action's setChecked()
Fix #21039 - Inspector: VBox height, HBox width and Spacer gap have wrong values

Fixed by changing the type of P_BOX_HEIGHT, P_BOX_WIDTH and P_SPACE properties
fix annoying bad french translation, impossible to export PDF