Add support for "double-click" and "hold" click types

Closes #1

See merge request !2

Previously, only single-clicks were supported.

Requires another configuration file update, to support various click types.

With changes from #2, any of the three click types can respond to an infinite number of entity states, limited only by what the HA entity returns.

Fixes #1

Simplify how configuration is read, allowing arbitrary states to trigger arbitrary responses

Closes #2

See merge request !1

Nice that there's a proper example now, too.

Fixes #2

Allows one handler to encompass what the Dash SHM and Dash Home Assistant integrations required.

Breaking change, though, as configuration variables change

It's a lot of bloat for one file, but I'd rather do this and keep in sync with Flic's releases.