fix #19904: Import of 1.2 TextStyles for titles

Add compatibility with TextStyles for 1.2 titles:
Change the 1.2 TextStyle "Poet" to "Lyricist" for 2.0.
Remove the zeroing of Rxoff and Ryoff, which causes title, subtitle,
composer and lyricist to be misplaced.
fix #19612
Merge pull request #202 from lvinken/musicxml-fixes

fix #19612
Add a test case score
Update the test harness to include textstyles
Merge pull request #198 from softins/1.2-titles-import

fix #19904: Import of 1.2 TextStyles for titles
add creation date as a meta tag in mscx file