[Changelog] squarell protocol

New protocol is supported in flespi telematics hub: Squarell
This is a changelog topic for the Squarell protocol.

The list of supported Squarell devices

Squarell protocol updated: implemented parsing of $FMS8, $FMS10 and $FMS12 messages

Squarell protocol is updated: parsing of double values in $FMS1 message is fixed.