Add extra System actions and notifications.

Conflicts:
	bundles/binding/org.openhab.binding.xbmc/src/main/java/org/openhab/binding/xbmc/rpc/XbmcConnector.java
XBMC - Initialize System.State correctly at startup

Conflicts:
	bundles/binding/org.openhab.binding.xbmc/src/main/java/org/openhab/binding/xbmc/rpc/XbmcConnector.java
Merge pull request #1397 from avdleeuw/XBMC_SystemEvents

[XBMC] Add extra 'System' actions and notifications.