Version 2.4

* completely rewrite UI architecture (use ViewModel instead of Loaders)
* improve robustness and responsiveness, especially when there are a lot of collections
* improve UI to make it more Material (for instance, use progress bars instead of deprecated progress dialogs)
* improve read-only contact behavior (contacts from read-only address books are now marked as read-only; in most Contact apps, you can still edit those contacts, but the changes will not persist)
* notify on invalid events, too (since 2.3, invalid tasks/vCards cause notifications)
* library and translation updates
* other improvements and bug fixes
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