companion for reddit

This is a modified version of the official reddit companion which can be found here:
https://chrome.google.com/webstore/detail/reddit-companion/algjnflpgoopkdijmkalfcifomdhmcbe

This version fixes some long outstanding bugs and adds some new things:

- https support: should work on (more) https pages now.
- notifications work again: the old companion used an outdated call.
- design tweaks: Less shadows, less gradients, less rounded corners.

Todo:

- Update the notifications to have a better suited icon that is not blurred out.
- Add support for moderation related tasks.
- Possibly integrate these with the moderator toolbox extension.