Style options for articulations

I think there's some room for improvement with the current style options for articulations. Currently you can set "chord automatic", "above chord", "below chord", "above staff" and "below staff". I propose breaking this into two menus, "Position: By notehead / Outside staff", and "Direction: Auto / Above / Below".

This solves a number of issues. For example, the style parameters make more sense: Notehead Distance would apply to articulations whose position is set to "By notehead" and Staff Distance would apply to those set to "Outside Staff" (Articulation Distance makes no sense). Also, articulations all have a "Direction" attribute, but it doesn't seem to do anything. Finally, and this is the main one for me, it allows the user to specify that they want the articulation outside the staff, but to obey chord direction. This is currently not an option, but makes sense for accents, as the default positioning isn't always desired (I suppose a quick fix would be to add this as a sixth anchor option).