Improve temperature controls (#872)

This improves the temperature control features to allow implementing
climate platform support for homeassistant.

Also adds frostprotection module, which is also used to turn
the thermostat on and off.

kasa/smart/modules/__init__.py

@@ -12,6 +12,7 @@ from .devicemodule import DeviceModule
 from .energymodule import EnergyModule
 from .fanmodule import FanModule
 from .firmware import Firmware
+from .frostprotection import FrostProtectionModule
 from .humidity import HumiditySensor
 from .ledmodule import LedModule
 from .lighttransitionmodule import LightTransitionModule
@@ -42,4 +43,5 @@ __all__ = [
     "ColorTemperatureModule",
     "ColorModule",
     "WaterleakSensor",
+    "FrostProtectionModule",
 ]