mappings#Initialize: Change mappings to `<nop>`

Since we're handling game actions in `mappings#Listen()` now, don't call
our functions from these normal mappings.

The reason for not doing so is because otherwise after you get a Game
Over you could still move the player around and fire missiles (although
doing so wouldn't affect your score).

Set these keys to `<nop>` so that they don't do their normal Vim
functions so we can maximise the feeling of being in the game world
versus being in a text editor. Otherwise you can move your cursor
around, record macros with `q`, and I'm just not sure I want to allow
all that in the game.

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