1.21.0

• BREAKING CHANGES: Deprecated the device "Action event" triggercard and replaced it with a generic "Action event" card which is not device specific but contains the device name as token. This is easier to maintain. Please update your flows by replacing the device specific card with the triggercard from the app. The functionality for the device specific card will be removed with the next major release.
• Added support for the new Shelly i3 (thanx to domotica-shop.nl for sending me a device).
• Added a new triggercard that can trigger a flow when a device is unreachable for a specified number of minutes (under device settings). This is only available for non-battery operated devices that are being polled for their status.
• Lots a code refactoring for easier maintenance.