Add keyboard press/release events for fine grained keyboard access

I'm not sure if this is possible or not, but having press/release events through the terminal would allow for cool unicode/text based games through iterm. I believe this can be done through using using raw keyboard input (which I'm not sure iterm supports), but I'm not sure how this works w/ OSX vs. Linux. Here's an article I found describing raw keyboard input in Linux: https://www.linuxjournal.com/article/1080

This is an example of Space Invaders (you can play it with docker run -it --rm pdevine/textinvaders) but I've had to fudge the way the keyboard controls the 'laser' sprite. This is passable w/ something like Space Invaders, but it's really terrible for most action games.

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