Viv d9b1476f4d

Add remaining support for branches (#BRANCHSTART r) (#21) ...

This PR adds the remaining changes needed to support branching TJA
songs.

- Properly handling `r` (drumroll) based branching conditions
- Handling commands that come after a measure end but _before_ the first
`#BRANCHSTART` command. (This was not previously covered by
`hol6po.tja`.)

As well, it adds a bit of cleanup/refactoring to the changes from the
previous branch PR (#20).

To test these changes, another new branching TJA-fumen pair is added to
the test suite.

2023-07-02 00:00:36 -04:00

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