ETH & UZH mensa Zürich

Patch: Fixed menu parsing error for ETH mensas. Last minor: New features and bugfixes! <em>Due to API and architecture restrictions, the F-Droid version of this app currently does not load menus from UZH mensas. Please use the version from <a href="https://github.com/fflopsi/mensa-zh/releases/latest/">GitHub</a>.</em> * A banner will warn of slow internet after loading for more than five seconds. * You can cancel the process or wait. * Fixes the issue where the app stops loading when expe