Key binding customization proposal

[John Hendrikx]

This is an extension that builds on top of the Behavior API proposal 
(see Public Behavior API proposal thread).

Summary:

Provide an opportunity to customize key bindings during construction 
time of standard behaviors, without exposing the internal|InputMap|s. 
The API is constructed in such a way to not block later enhancements to 
allow|InputMap|s to be shared or made immutable.

Goals:

  * Provide API to customize key bindings provided by default behaviors
  * Provide a public class|KeyBinding|which is lighter weight, and immutable
  * Integrate with Behavior proposal
  * Keep internal details of|InputMap|implementation hidden (it is too
    complex, and consumes far too much resources)

See the full proposal here: 
https://gist.github.com/hjohn/e432f17452ff13511820487e3602b847

--John
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