Rewrite frontend

With this commit pretty much the whole frontend has been rewritten.
This should hopefully fix most of the issues in “exotic” styles.

The changes include:

- Overall cleanup
- Better adaption to the WCF design
- Reworked private channels menu
- Reworked sidebar (may change later, currently the heights of the elements are hardcoded and not dynamic)
- Working user action menu
- Fixed auto scrolling
- Better visual notifications

- This software does not contain any easter eggs
- No penguins were harmed in the production of this software

Todo:

- Fullscreen mode
- Some language variables
Bump version number
Fix message types being treated as strings
Fix leftover of “stringy“ message types
Improve fullscreen
Adjust sidebar height in fullscreen mode
Fix private channels in fullscreen mode
Fix typo in __copyright.tpl
Update language variables
Push version number
Merge branch 'frontend' of github.com:wbbaddons/Tims-Chat into frontend
Fix sidebar padding in fullscreen mode and update some language variables
Merge branch 'frontend'

Conflicts:
	template/chat.tpl

Closes #52
Closes #54
Closes #55
See #57
Closes #68
Closes #70