Leaving on review still


** [issues:#4937] [GSoC] Implement cross-voice dynamic spanners**

**Status:** Started
**Created:** Wed Jul 20, 2016 12:56 AM UTC by Nathan Chou
**Last Updated:** Thu Sep 15, 2016 06:10 PM UTC
**Owner:** Nathan Chou

[GSoC] Implement cross-voice dynamic spanners

\= was changed to allow setting spanner-share-context property on
events. spanner-id was consequently changed to a key.

Spanner_engraver class modifies a new context property sharedSpanners.
Spanner information, including the Spanner object and the current
voice the spanner belongs to, is stored in this property. If a context
above Voice is used, other voices may see the spanner and modify it.

Dynamic_engraver and Dynamic_align_engraver were changed to support
cross-voice spanners using the above mechanics. I rewrote portions of
Dynamic_align_engraver to do this more easily.

<< { c\=Score.hello\< d e f } \\ { e f g\=Score.hello\! a } >>
\new Staff { << { c d e\=Staff.hello\< f } >> << { g\> f\!\=Staff.hello\! e d } 
>> }
\new Staff { c d e\=1\< f\=2\< g f\=1\! e\=2\! d }



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