lots of work still to do:
* need to optimize the drawings for array elements for ds arrays
* need to optimize [draw array] as well

This was initially part of an effort to prevent double binding to scalars
for certain event callbacks. By unvis'ing all scalars in the graph this
would ensure the symbol would get unbound.

However, we're already doing that in canvas_map. So it appears this extra
unvis'ing in graph_vis was unnecessary.

However, it looks like the scalar in a gop will get unvis'd twice when
destroying the gop canvas. No idea why that is, but if there's a regression
perhaps one of the few people using scalar events will report a regression :)

* give new cord the same color as selected line (except for vanilla/ext presets)
* make broken object stand out more
* make comment dash sizes match l2ork 1.0
* change xlet hover animation to match new xlet style

Fixed bug where GOP patches inside a GOP got highlighted when the parent GOP was selected. By default no subpatches or objects should be visibly highlighted. This should close issue #623.