* enable UoM for rpm values
* support uom for non-hour time channels
* add state options for frost setting
* add data type for percentage
* support DecimalType for QuantityType channels
* support rfc2217
* improve state description for time channels
* improve code style in DataTypes
* remove unnecessary command type check
* enable UoM for enthalpy timer
Signed-off-by: Hans Böhm <h.boehm@gmx.at>