ProjectExplorer: Make Project::id value based

Change-Id: Ie210d2a068158c6caaac66aae58cbd886f61c18d
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/cpptools/modelmanagertesthelper.cpp

@@ -39,6 +39,7 @@ TestProject::TestProject(const QString &name, QObject *parent)
     : m_name (name)
 {
     setParent(parent);
+    setId(Core::Id::fromString(name));
 }
 
 TestProject::~TestProject()