Project explorer: Make public headers compile with NO_CAST_FROM_ASCII

.. and purge unneeded includes.

src/plugins/qt4projectmanager/qt-s60/s60emulatorrunconfiguration.cpp

@@ -40,6 +40,7 @@
 #include <utils/qtcassert.h>
 #include <projectexplorer/projectexplorerconstants.h>
 #include <projectexplorer/project.h>
+#include <projectexplorer/persistentsettings.h>
 
 using namespace ProjectExplorer;
 using namespace Qt4ProjectManager::Internal;