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.h

@@ -15,6 +15,7 @@ QT_END_NAMESPACE
 class Notificator: public QObject
 {
     Q_OBJECT
+
 public:
     /** Create a new notificator.
        @note Ownership of trayIcon is not transferred to this object.
@@ -25,13 +26,12 @@ public:
     // Message class
     enum Class
     {
-        Information,         /**< Informational message */
-        Warning,             /**< Notify user of potential problem */
-        Critical             /**< An error occurred */
+        Information,    /**< Informational message */
+        Warning,        /**< Notify user of potential problem */
+        Critical        /**< An error occurred */
     };
 
 public slots:
-
     /** Show notification message.
        @param[in] cls    general message class
        @param[in] title  title shown with message