some text improvments, consolidations and capitalization fixes

- change "AUTO" to "Automatic" in measure properties and also capitalize the other entries in that popup
- fix #36291: consolidate popup menus for line types and fix capitalization
- fix QComboBox items' capitalization in Debugger 
- fix QComboBox items' capitalization in Inspector
- fix some more QComboBox items' capitalization in 'normal' MuseScore dialogs and
    for note head names, where they get set programatically.
    Also change Xcircle to XCircle.
- fix tooltips to use Sentence case


probably worth putting a comment at the top of this file to let other people know that the first line is a menu item so Title Case while the second is used as a tooltip so Sentence case. What do you think?