Refactor the JavaScript: IIFE's and event listeners

[pjc09h]

Currently, a lot of the site JavaScript uses raw functions dumped into a file. This causes problems with Google Closure Compiler, which in its advanced optimization mode, aggressively rewrites function names. This prevents me from using anything more than simple optimizations. The solution is to encapsulate all JavaScript in self-executing arrow functions (() => { /* ... */ })(); whose contents look for certain events such as clicking a widget and such.