Set Mscore::DPI from logical DPI not physical
Initial implementation of copying and pasting of staff collateral elements.
Added tests for the elements currently supported: articulations, chord names, figured bass, lyrics.
Added colour property to the lines of a staff.

Colour is set with a colour box in the Staff Properties dialogue box.
fix #23219
Merge pull request #505 from softins/logical-dpi

Set Mscore::DPI from logical DPI not physical
Merge pull request #507 from mgavioli/multi-symbol-paste

Pasting of symbol list selection
Merge pull request #512 from mgavioli/staff_colour

Added colour property to the lines of a staff.
Merge pull request #519 from Jojo-Schmitz/orig.strings

fix #23219