Inject peniquitous.js into the page context

Instead of handling the keyboard events in the content script, inject a
script onto the page that does the key listening and simulating.

This allows the simulation of up & down arrow key presses to actually
trigger the proper page event listeners and allow our custom code to do
the right thing instead of firing a key event in the Chrome extension's
isolated environment and not having anything happening because no
listeners are attached in the isolated environment.

Also inject the `KeyEvent` object from Mousetrap so we can use it's key
simulation feature. Will likely want to extract that into our own custom
code so we're not including a whole script that we only use 20% of or
so.

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