Adding thermostat feature

[andMaximus]

We recently bought a new house that comes with a WiFi thermostat which controls the electric floor heating in our bathroom. The make and model of which are Magnum MRC Remote control which is supported by an OEM white label Tuya application. Unfortunately this app does not directly integrate with HomeKit, therefore a Homebridge plugin was required. The current version of homebridge-tuya does not provide support for thermostat devices where custom names are provided to select specific heating schedules. In the case of our thermostat, AUTO runs the regular schedule, and MANUAL, FROST or HOLIDAY should be used to deviate from the regular programming.

This feature aims to solve this need by splitting out the operational state of the thermostat (heating vs. idle), and the currently active heating mode (schedule vs. override), and provides the option to use the devices own enumerations for each operating state

For our specific device MRC Remote control these are the required settings:

Function	Name in config	DP	Possible Values
Heating indicator	dpActive	118	"warming" (corresponds to idle) / "heating" (corresponds to heating)
Program status	dpProgramState	103	"AUTO" / "MANUAL" / "FROST" / "HOLIDAY"
Desired temperature	dpDesiredTemperature	102	temperature multiplied by 10
Current temperature	dpCurrentTemperature	106	temperature multiplied by 10

[andMaximus]

Just made some fixes to ensure that the state always updates as soon as the thermostat communicates new info

[andMaximus]

@iRayanKhan We have to make some alterations regarding how dpActive & dpProgramState are handled, as the thermostat feature needs to work both with strings ("heating"/"warming") and boolean (true/false). Different thermostats report their operating mode in different ways (as can be seen in issue #333). Perhaps we can integrate this as toggles in the config-ui pane?

[andMaximus]

@iRayanKhan I implemented a toggle so the user can pick either strings ("heating"/"warming") and boolean (true/false) compare for the state of the device.