[venstarthermostat] Venstar thermostat away mode enhancement (#10736)

[venstarthermostat] Venstar thermostat away mode enhancement (#10736)

* [VENSTAR THERMOSTAT BINDING] ADD AWAY MODE

Signed-off-by: Matthew Davies
matthew.davies@skynet.be
Signed-off-by: raveydavies <84205523+raveydavies@users.noreply.github.com>
* [VENSTAR THERMOSTAT] FIXED COMMAND AWAY MODE

Signed-off-by: Matthew Davies
matthew.davies@skynet.be
Signed-off-by: raveydavies <84205523+raveydavies@users.noreply.github.com>
* VENSTAR THERMOSTAT AWAY MODE AFTER INITIAL COMMIT FEEDBACK

This code includes the Away mode of the Venstar thermostat. It is
updated following initial feedback and suggestions on my first version
from @digitaldan.

Signed-off-by: Matthew Davies <matthew.davies@skynet.be>
Signed-off-by: raveydavies <84205523+raveydavies@users.noreply.github.com>
* VENSTAR THERMOSTAT BINDING - INCLUDE AWAY MODE

Removed the updateThermostat function, now have updateSettings and
updateControls corresponding to local API URLs.

Signed-off-by: Matthew Davies
<matthew.davies@skynet.be>
Signed-off-by: raveydavies <84205523+raveydavies@users.noreply.github.com>
* VENSTAR THERMOSTAT AWAY MODE - Modification updated as per feedback 1
June 2021

Signed-off-by: Matthew Davies
<matthew.davies@skynet.be>
Signed-off-by: raveydavies <84205523+raveydavies@users.noreply.github.com>
* VENSTAR THERMOSTAT AWAY MODE INCLUSION - UPDATED README

Signed-off-by: Matthew Davies <matthew.davies@skynet.be>
Signed-off-by: raveydavies <84205523+raveydavies@users.noreply.github.com>