Add a property `jianpuBeaming` needed to support Jianpu (numbered musical notation).

[yuanyelele]

Dear list,

I'm currently bug fixing and improving an older script, jianpu10a.ly 
<https://github.com/nybbs2003/lilypond-Jianpu/blob/master/jianpu10a.ly>, which 
aims to introduce Jianpu (numbered musical notation) 
<https://en.wikipedia.org/wiki/Numbered_musical_notation> to Lilypond. The 
ultimate goal here is to incorporate a JianpuStaff directly into Lilypond 
(similar to the VaticanaStaff) if possible. However, there's still a fair 
amount of work left to be done. I've attached a work-in-progress version, and 
I'd greatly appreciate any assistance.

In Jianpu, different numbers of underlines are used to indicate note values, 
much like the way beams function in standard staff notation. Therefore, in the 
script, the underlines are currently rendered using beams.

These two patches introduce a boolean context property called jianpuBeaming, 
which enables a relatively straightforward 'beamify' behavior: when stems point 
downward (so beams being positioned beneath the note heads), each beamlet 
covers the width of the corresponding group of note heads.

I haven't added any documentation or regression tests at this stage since the 
feature isn't quite ready, and this property serves no other purpose for now. 
However, please feel free to help me add them if they become necessary.

And, thank you for this awesome software. Your help means a lot!

Yuan Ye

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beam.ly
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0002-Implement-the-context-property-jianpuBeaming.patch
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0001-Add-context-property-jianpuBeaming.patch
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