add more customization to jumplines

[Bernhard Weichel]

Request

I got requests for more customization of jumplines

• let jumplines join and add the arrow on the join point
• define jumpline base relative to the note center

Solution approach

• use the same configuration for Jumplines in general and for the individual jumpline
• add more parameters:
  • segments [1,2,3]
  • jumpline-anchor [x,y]
  • vcut
  • anchor-base [border | center]
  • arrow-size [x, y]
  • shape {1: {cp1:, cp2}, 2:{cp1:, cp2}, 3: {cp1:, cp2}}