QmlDebugging: Add service client for QmlDebugger

Qt5 has renamed the service 'QDeclarativeEngine' to 'QmlDebugger'.
Add a new client to connect to the service.

Change-Id: I3a03181c4f34c311e47d4a963283b66dc778726b
Reviewed-by: Kai Koehne <kai.koehne@nokia.com>

src/libs/qmljsdebugclient/qmljsdebugclient.qbs

@@ -36,7 +36,10 @@ DynamicLibrary {
         "qmlprofilertraceclient.h",
         "qpacketprotocol.h",
         "qdebugmessageclient.cpp",
-        "qdebugmessageclient.h"
+        "qdebugmessageclient.h",
+        "qdeclarativeengineclient.h",
+        "qmldebuggerclient.h",
+        "qmldebuggerclient.cpp"
     ]
 
     ProductModule {