Rename namespace Core::Utils into Utils

Also move Designer::Internal::FormWindowEditor ->
Designer::FormWindowEditor.

src/libs/utils/basevalidatinglineedit.h

@@ -34,7 +34,6 @@
 
 #include <QtGui/QLineEdit>
 
-namespace Core {
 namespace Utils {
 
 struct BaseValidatingLineEditPrivate;
@@ -98,6 +97,5 @@ private:
 };
 
 } // namespace Utils
-} // namespace Core
 
 #endif // BASEVALIDATINGLINEEDIT_H