QRegExp include cleanup

This patch adds the missing include statements for QRegExp.

Change-Id: Ibb03b929940adb84ae190b5090cb6b88653cc14c
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/pythoneditor/pythoneditorplugin.cpp

@@ -60,6 +60,7 @@
 #include <QtPlugin>
 #include <QCoreApplication>
 #include <QFormLayout>
+#include <QRegExp>
 
 using namespace Core;
 using namespace ProjectExplorer;