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/editaddressdialog.cpp

@@ -1,5 +1,6 @@
 #include "editaddressdialog.h"
 #include "ui_editaddressdialog.h"
+
 #include "addresstablemodel.h"
 #include "guiutil.h"