Migration from java-enocean-library to opencean-core and added support for window handles

Migration from java-enocean-library to the successor library opencean-core.

Added support for window handles to visualize the state of a window (OPEN, CLOSED, AJAR).
The window has to be configured as StringItem.

Example:
String Window_FF_Office "Window Office" <contact> (FF_Office, Windows)
{enocean="{id=00:12:58:50, eep=F6:10:00}"}(OPEN, CLOSED, AJAR)