Delegate handlers to single Mousetrap binding

[chrisui]

HotKeys currently creates a Mousetrap instance for each component mounted. This could be optimized for the cases where you had many hotkey targets (imagine hundreds of node's you had a 'delete' hotkey for) by having a single instance where handlers were bound to.

[chrisui]

Having a single HotKeyManager would also solve the issue seen here. If a deep handler is triggered for a key sequence which is a subset of a root sequence (Eg. up in up down left right) then the root sequence would never fire!

[chrisui]

Note with 98b65bc the propagation issue seen in the mentioned example is now fixed.

A single delegation point should still be written though for best performance moving forwards.

[chrisui]

Closing to be tracked in #2

Might re-open if it drops from v1 scope.

[greena13]

Reopening to track separately.

[greena13]

Closing as soon to be no longer relevant, with the removal of Mousetrap in version 2.0.0