ProjectManager: Use Core::Id for progress types

Change-Id: I72993fda50ad70ad2d7c2f449923ac6e34b9e737
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/coreplugin/coreplugin.cpp

@@ -48,9 +48,10 @@
 using namespace Core;
 using namespace Core::Internal;
 
-CorePlugin::CorePlugin() :
-    m_mainWindow(new MainWindow), m_editMode(0), m_designMode(0)
+CorePlugin::CorePlugin() : m_editMode(0), m_designMode(0)
 {
+    qRegisterMetaType<Core::Id>();
+    m_mainWindow = new MainWindow;
 }
 
 CorePlugin::~CorePlugin()