[UI] A small change... for a start

[Gary Chambers]

Well, not that small.

After a lengthy discussion with Sig (Igor) last night we came to the
conclusion that it would be nice to improve the behaviour of
colours/fillstyles passed to canvases for drawing.

At present, the canvas code directly checks the type of fillstyle and does
things accordingly. It would, IMHO, be better if the canvas
double-dispatched to the fillstyle to achieve its ends.

This would allow, for instance, a CompositeFillStyle class to be
implemented, facilitating fills of the kind shown in the attachments (from
Sig).

All without having to rework Morphic's handling of its fillstyles (short of
actually assigning a new kind of fillstyle to a particular Morph).

Even the more esoteric example from Sig (star_fills) would be possible.
Of course, the suggested composite fill would be cool enough!

Comments around this would be welcome before I proceed...

Regards, Gary.
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