Move api class to plugin

[spacedmonkey]

Summary

Simple refactor moving the api class to the plugin class. This clears the code up a lot and make sense of the interdepencies of the class. Now, plugin is passed into all sub classes and contains a copy of all the all util classes, rest api, settings and hotlink.

Checklist

• [ ] My pull request is addressing an open issue (please create one otherwise).
• [ ] My code is tested and passes existing tests.
• [ ] My code follows the Contributing Guidelines (updates are often made to the guidelines, check it out periodically).