Public Behavior API proposal

[John Hendrikx]

As promised,  a public Behavior API proposal.

Summary:

Introduce a new|Behavior|interface that can be set on a control to 
replace its current behavior. The new behavior can be fully custom or 
composed (or later subclassed) from a default behavior. Some default 
behaviors will be provided as part of this proposal, but not all.

See here: https://gist.github.com/hjohn/293f3b0ec98562547d49832a2ce56fe7

--John
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