CUL based bindings for FHT, FS20, Intertechno, EM and S300TH

This pull requests consists of the CUL transport bundle and several bindings based on CUL transport. These bindings are for FHT (heating control), FS20 (Switches, dimmers and contacts), EM (enegery measurement), Intertechno (Switches) and S300TH (Temperature and humidity sensors).
Except for the EM bindings all these bindings are tested with real devices.