Migrate to Discord.js 12 (development version)

Migrates Geike to the latest version (as of some hours ago) of discord.js in an attempt to alleviate some streaming bugs (mainly the audio cutting out too soon, the infamous issue #1 (closed)). Also includes a quick fix attempt for #34 (closed), and censoring of the Google API token, which I've since also put in master (6fdc1551 and 3cea1a80, respectively).

Needs additional testing however. Currently the d.js-12 version runs on Geike Devel in f00f.