Changed DB Schema

* DB Schema now supports setting favourites
* Added Colums for future addition of HOTP Tokens
* Created DB-Update Logic
Changed MainView to support favourites

* Added switch to show status
* Save selected favourite to LocalStorage DB
Changed favourite switch to icon
Finalized favourites feature

* Favourite is now shown on the ActiveCover
* Added possibility to "unstar" a favourite
Added copy token on tap
Merge branch 'feat-cover' into develop