CMake: Hide INTERNAL and STATIC configuration entries in Project UI

Task-number: QTCREATORBUG-18403
Change-Id: I6b69305ff0dc337da1d8b20e0321be5ce1b1f595
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/cmakeprojectmanager/configmodel.h

@@ -45,6 +45,7 @@ public:
 
         QString key;
         Type type = STRING;
+        bool isHidden = false;
         bool isAdvanced = false;
         bool inCMakeCache = false;
         QString value;