[MU4 Issue] Slurs, ties, lines extend beyond final barline

[its-not-nice]

All lines (slurs, ties, melisma lines, hairpins, pedal markings, trills, etc.) should end at the position of the final barline of the system, with a sliver of padding, and not extend beyond it.

Should fix:

https://musescore.org/en/node/322036
https://musescore.org/en/node/322037
https://musescore.org/en/node/319761

[asattely]

Taking a look at this now!