Added helper method to short-circuit built-in XCode key bindings.
Added helper method to short-circuit built-in XCode key bindings.

(BOOL)windowShouldReceive:(SEL)keySelector
Eventually, it might be nice to have this method ask Xcode
if we need to prevent the key event propagation.

See discussion here:
https://github.com/JugglerShu/XVim/issues/249

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