by Lukáš Uher
Shows calendar events reminders merged into one notification with ability to check finished events for removing from notification list.
Set low notification category in block 18 and urgent/high category in block 49.
Modify block 2 to set calendar application.
v2: some visual changes in notifications
v3: removed vibrate+sound blocks, replaced by notif category setting. Fixed summary dismiss when all reminders completed.
v4: fixed double notification. Added action to keep event showed in single notification
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