Mailcal 1.0.0 beta 4

Fourth beta: SubcalScriber's subscribed feeds, built into Mailcal.

New: feeds

• A MAILBOX · FEEDS switch under the top bar. Switch by tapping it, swiping sideways on the agenda, or (in month view) tapping the selected day again. Swiping on the month grid still changes months.
• Feeds are read-only .ics / webcal calendars. Add them from MENU → FEEDS by typing or pasting a link; Google share links work for public calendars, and a feed names itself from the calendar.
• Tap a feed to rename it, hide it from the agenda, refresh it or remove it.
• Feeds refresh hourly: when the app opens and in the background.
• List and month views work for both.

Changed

• Update errors show as a short "Couldn't update" next to the tabs (tap for details), so the screen doesn't shift.

No new permissions. Install: adb install -r mailcal-1.0.0-beta.4.apk (updates in place; you stay signed in).

Going back to beta 3: Android won't install an older version over a newer one, so uninstall Mailcal first (this signs you out and removes added feeds; nothing on mailbox.org changes), then install mailcal-1.0.0-beta.3.apk from the beta 3 release. Beta 3's code is kept on the pre-feeds branch.