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Allow Espresso::Key in Keyboard#key

Chris Watson requested to merge watzon/espresso:feature/proper-keyboard-enum-support into master

Currently the key parameter for the Keyboard#key and Keyboard#key? methods are untyped, meaning you have to pass in a LibGLFW::Key instance. Seeing as Espresso::Key exists I figured it made more sense to strongly type it and add a conversion from Espresso::Key to LibGLFW::Key.

This allows those methods to be used with the shorthand symbol notation, which is nice.

if keyboard.key?(:escape)
  # do something
end

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