DCML>RNTXT (enhancement). Software version in metadata

[MarkGotham]

One to consider:

For DCML>RNTXT and any other new conversions, possibly add software version in the metadata preamble.

music21 version (exists)

• music21._version.__version_info__

Conversion version (TODO?):

• DCML v2 DCML-romantext parser v. 2023.07 or similar.

ms3 version notes from @johentsch

import ms3
from git import Repo

data_repository = Repo(corpus_path)
print(f"data_repository @ {data_repository.commit().hexsha[:7]}")
print(f"ms3 version {ms3.__version__}") # should work with most libraries