Bitcoin-Qt: massive header and cpp cleanup

- try to enforce the same style to all Qt related files
- remove unneeded includes from the files
- add missing Q_OBJECT, QT_BEGIN_NAMESPACE / QT_END_NAMESPACE
- prepares for a pull-req to include Qt5 compatibility

src/qt/notificator.cpp

@@ -12,7 +12,7 @@
 #include <QImageWriter>
 
 #ifdef USE_DBUS
-#include <QtDBus/QtDBus>
+#include <QtDBus>
 #include <stdint.h>
 #endif