Release 1.15.0+74

Features:
* Star feed items as favorites; the favorite state syncs across channels sharing the same article link and is kept through feed updates
* Filter the item list by All / Unread / Read / Favorites
* Sort items by newest or oldest with a new sort toggle button
* Mark all items as read from the home screen toolbar, or per channel from the channel edit row

Fixes:
* Editing a feed item link now saves the normalized https link and opens it in the browser only after the save succeeds
