UicCodeModelSupport: Make the code not so eager to run uic processes

Instead mostly postpone it until the contents are needed.

Task-number: QTCREATORBUG-9149

Change-Id: I83167537e97fbd965531d990c8073409ff7b0b32
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/plugins/cmakeprojectmanager/cmakeuicodemodelsupport.h

@@ -42,6 +42,7 @@ class CMakeProject;
 
 class CMakeUiCodeModelSupport : public CppTools::UiCodeModelSupport
 {
+    Q_OBJECT
 public:
     CMakeUiCodeModelSupport(CPlusPlus::CppModelManagerInterface *modelmanager,
                           CMakeProject *project,