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Issue 4505: Add partial \override and \set commands
This allows \set and \override commands to be stopped short after
their `=' sign in order to be used in the manner of partial music
functions.
Also contains commits:
Add/import music functions Syntax::property-{override,set)-function
Syntax::property_operation -> Syntax::property_{override,revert,set,unset}
No point in joining and later splitting separate functions. The
original motivation might have been to reduce name space pollution, but
(scm ly-syntax-constructors) is a separate module by now.
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