Allow to style the representation of Voices

[bwl21]

Request

in complex pieces, one would like to change the color of the flowline on a per voice basis

As a pity some voice properties are controlled by lists of voices to apply:

Flowlines, Barnumbers, Countnotes, Repeatsigns, restpositions

Solution Approach

1. append to the current solution

• predefine a set of voice properties E.g.

voicestyle: {
  voices: 
   flowline: {
      line_width:
      color:
     line_dash
   },
 layout{
    ELLIPSE_SIZE:
    REST_SIZE
   }
repeatsigns:
barnumbers:
countnotes:
restposition: 
}

We could also implement a color scheme like this http://paletton.com/#uid=72z0v0kknrBJcVsqVxjvQfNQq5+

open issue

• this adds redundancy in the configuration. How shall we handle this?
• the effective value is no longer to be easily processed