Support for String and Number items in pilight binding

This update for the pilight bindings adds support for getting string and number values from pilight, for example temperature readings from a 433Mhz weather station.

[Updated wiki page](https://github.com/idserda/openhab/wiki/pilight-Binding)
name does not meet the cardinality of the parameter. Could you change to single occurrence "setDeviceDecimal".