Fix #20096: Chord name navigation

Provides the following navigation in edit mode for Chord Names:
Tab/Shift-Tab - start of next/previous measure.
Space/Shift-Space - next/previous note, rest or chordname.
;/: - next/previous beat, according to time signature.
Ctrl-1..Ctrl-9 - move forward by specified duration (like f.b.).

There are still issues of layout and display to address, but they
will be approached separately.
Remove unnecessary parent checks harmonyEndEdit()
Correctly read hexadecimal codepoints.
Correct error in last commit.
Update font name and Unicode code points for 2.0
Check the track for a Harmony annotation.
Merge pull request #238 from softins/20096-chord-symbol-entry

Fix #20096: Chord name navigation