Patch: Menus for next week are now display correctly for ETH. Last minor:

The Mensa app with the familiar look, new features and improved performance!

What's new:

* Menus for tomorrow, this week or next week available
* Images of menus visible
* Locations can be sorted or hidden
* Mensas can be favourited (displayed at the top) or hidden
* All this and more can be configured in the new settings page
* Faster display of today's menus, other improvements and bug fixes
