Phonenumber validation and normalisation

More controls for phone number, and use HomeAssistant region config to fix partial numbers that will fail on Mikrotik for send.

Overhaul and tests

Updated code to follow current HomeAssistant usage, added tests, docs, GitHub actions

0.7.0 Timeout configurable and more fully async

docs update

Retrospective release

0.1.0

Update hacs.json