qmljs: uniform property info

CppComponent has extra information on properties that makes sense
also for ObjectValues, change the processProperty method to pass
in an extra struct with that info (and that can be later extended).

Change-Id: If09b178a4095bed03ff59bfb2164088309d2c8e2
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>

src/plugins/qmljseditor/qmljscompletionassist.cpp

@@ -245,7 +245,7 @@ private:
         (*_propertyProcessor)(_currentObject, name, value);
     }
 
-    bool processProperty(const QString &name, const Value *value) QTC_OVERRIDE
+    bool processProperty(const QString &name, const Value *value, const PropertyInfo &) QTC_OVERRIDE
     {
         process(name, value);
         return true;