Thee Context class was renamed to DrawContext -- this is where matStack and gc
reside. This is used only during drawing and nowhere else.

A new class called UIContext holds the user interface state -- selection list,
edit stack and so on.

A drawing context can be given a UIContext, otherwise it'll construct a default 
one
where nothing is selected, nothing is on the edit stack, and so on.

Cheers, Kuba
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