Issue 3890: Add dodecaphonic-first accidental style

This accidental style assigns accidentals to _all_ pitches
(just as dodecaphonic does) but remembers them throughout
a whole measure.
This style is useful for different styles of contemporary notation
that want to make use of the non-tonal dodecaphonic style but don't
want to print so many redundant accidentals.
Issue 3890: Add doc for dodecaphonic-first accidental style