Now displaying global direction diagram, though currently without any indication which direction is which
Global directions which calculate no "overall" direction will now use the direction of their first instance on the diagram
Lines are now colored from the "main" color selector, rather than the "border" selector, which avoids being able to set their color to "none". Renamed "stroke" DOM classes to be easier to manipulate.
The "next cell ID" and "next direction number" counters now calculate initial values to take into account the existing cells when loading the shape designer for an existing variant