schema: make all members of att.controlEvent also part of att.color

[rettinghaus]

As discussed in #1086, all control elements should have @color available.

This affects

• attacca
• dir
• dynam
• f
• fing
• fingGrp
• harm
• metaMark
• repeatMark

Closes #1086.
Closes #1454.

[musicEnfanthen]

Thank you @rettinghaus. Just a little sorting propsal above.

While you are at it, maybe you can have a look at the order of att.trill.vis memberships, too? It is not changed in this PR because it already had the att.color membership, but as it is also one of the members of att.controlevent, it may be reasonable to fix it along the way.

I also realized that <attaca>, <beamSpan>, and <tupletSpan> are the only controlevents without direct att.color class now. While the two span elements inherit it via their membership in att.beam.vis and att.tuplet.vis, it seems that <attaca> is simply missing it?

[rettinghaus]

@musicEnfanthen Thanks for pointing out attacca. I made it also member of att.color and integrated now #1455, so everything is in one place.

Additionally I did some more spring cleaning with the sorting.