Define display-4k-vertical

I recently acquired a new monitor, which I'm orienting vertically for logs,
chats, etc. As such I needed to add more functions, KBDs to wrangle the
setup. To DRY up my code, I define a macro, `display-register`, as a DSL for
supporting new monitors. This:
- defines two functions for enabling and disabling the displays
- defines a constant, `display-<name>`

It's basically just a wrapper around `xrandr`, and that's good enough for now.

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