v1.7 almost ready

All changes needed for v1.7 are ready. What is remaining is final testing, and then it will be released. The today widget is now also supporting dark mode, and a problem where it sometimes wouldn’t load is also fixed.

XCode 11 & iOS 13

The migration to XCode 11 in combination with iOS 13 leads to various layout problems, the current priority is to get those fixed. Once all screens look good again, the next step is to automatically follow the system-wide dark mode setting.