Update 8chan Z from 0.3.3 to 0.3.7

Update includes the following changes (from CHANGELOG):

- Implemented a try-catch for Main.ready
- If it fails, then it waits for DOMContentLoaded
- Should be faster and event more consistent
- Fixed a problem where Main.ready could be recursively called
infinitely
- Default to yotsuba.css (temporary)
- TODO: Save values
- Removed unnecessary Threads
- Merged into individual Thread objects
- Better try-catch-finally in Main
- TODO: Stop Settings from initializing part-ways twice
- Separated makeGlobal from Z constructor
- Threads stop XHRing after 4 404 returns
- To be expanded
- Threads now have active states