Add support for half degrees in temperature status of Air conditioner

[Luiggi7]

The Air Conditioner has the possibility of requesting current temperature of some sensor, or reading it from a file. It works well, but it only uses the integer values, so the decimal part of the value is not handled. For example, if the file has the value 20,7ºC the AC only shows 20ºC. At least it could handle the half degrees (20.5º, 21º, 21,5º, ...) thanks.