enhance 1.2 symbol import
tune layout rules to better match 1.2 behaviour
check for bad note head types
Note inspector head type combo box is misaligned with HeadType values:

Combo box starts from 0 and enum starts from -1: added delta to code getting and setting combo box
fix regressions test for note: bad head type
update 1.2 import regression tests!
Merge pull request #187 from mgavioli/Fix_#19863_note_head_type_in_inspector

Fix #19863 - Inspector Note head type combo box misaligned with HeadType values