FileManager updated and some other changes

Changelog
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- The FileManager prototype is almost finished! I also want to create
nice error messages and build an awesome uploader (copy, move and
compress will be implemented after this).
- The CPanel Crud plugin is now changed to a jQuery plugin, this is much
better and structured.
- In the future we will be using knockout-js for almost all javascript
actions, the FileManager is already entirely written using Knockout.
Next up are: user-management and dashboard management. After this the
rest will follow.