Add score/part titles

[craigsapp]

When a score staff shares multiple parts, allow for a joined name and individual name.

Here is an example:

Currently the name for the staff is searched until the first data line is found, and the title is searched after *^. Make any spine manipulator also stop the search for a staff name so that "Oboi" would be used in this case.

Test data:

**kern
*oboe
*I"Oboi
*I'obs.
*clefG2
*M4/4
*^
*I"Oboe 1   *I"Oboe2
*I'ob1  *I'ob2
*join   *join
=1  =1
4cc 4g
2b  4a
.   4f
8ccL    8aL
8ddJ    8gJ
=   =
*v  *v
*-

Extracting parts works, since the last *I" and *I' are used, and there is no spine manipulator to stop the search for the secondary labels:

Here is the compiled filter extract -e | extract -r:

**kern  **kern
*oboe   *oboe
*I"Oboi *I"Oboi
*I"obs. *I"obs.
*clefG2 *clefG2
*M4/4   *M4/4
*   *
*I"Oboe2    *I"Oboe 1
*I'ob2  *I'ob1
*join   *join
=1  =1
4g  4cc
4a  2b
4f  .
8aL 8ccL
8gJ 8ddJ
=   =
*   *
*-  *-

[craigsapp]

Implemented with commit https://github.com/rism-digital/verovio/commit/62baa906ce9de273e9e6c7e5b57d8d8347bade84

Example:

**kern
*oboe
*I"Oboi
*I'obs.
*clefG2
*M4/4
*^
*I"Oboe 1   *I"Oboe2
*I'ob1  *I'ob2
*join   *join
=1  =1
4cc 4g
2b  4a
.   4f
8ccL    8aL
8ddJ    8gJ
=   =
*v  *v
*-

Now renders as:

Click to view MEI translation of above Humdrum data

```xml