expose class BarLine with property barLineType to scripting

[heuchi]

This exposes BarLine and the BarLineType enum the same way as AccidentalType is exposed (using a QmlBarLineType enum).
While trying to use the barLineType property, I noticed that class BarLine was not yet registered in mscore.cpp.

Once again needed for my courtesy accidental plugin.

[Jojo-Schmitz]

We can't use Ms::BarLineType for this?

[heuchi]

Unfortunately we can't.
See this thread from the developer mailing list.
There has been some discussion about this issue already, but since Werner has recently moved some enums (AccidentalType, AccidentalRole) out of class Accidental (which was a rather large commit), I followed the model he used then.

[heuchi]

As requested by Werner I added a test in tst_scripting if BarLineType and QmlBarLineType match.
I hope this is the place to do this.

[heuchi]

@lasconic any chance this is going to be included in v2.0.1?

[lasconic]

So far I didn't merge anything regarding the new way to expose enums in 2.0.1 or the new scripting tests. So no, unlikely as it is right now.