Jun 15–21: many-to-many one-way syncs

New and improved

• One-way syncs can now send events from several calendars into several others at once.

Fixed

• If you sync only events you said yes to, unanswered invites are now left out.
• Adding a calendar to a two-way sync no longer fails with "No calendars match your search".
• Removing an account with thousands of events is faster and no longer gets stuck after access is revoked.