flexit-modbus 0.1.0

Initial release of the asynchronous Flexit CI66 Modbus library.

Highlights:

• Read Flexit measurements and writable setpoints through an injected ModbusUnit
• Control target temperature and fan mode with validation
• Expose neutral datapoint metadata and derived system activity
• Support TCP and serial transports through modbus-connection
• Require modbus-connection 4.10.0 or newer