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/addresstablemodel.cpp

@@ -1,4 +1,5 @@
 #include "addresstablemodel.h"
+
 #include "guiutil.h"
 #include "walletmodel.h"
 
@@ -6,7 +7,6 @@
 #include "base58.h"
 
 #include <QFont>
-#include <QColor>
 
 const QString AddressTableModel::Send = "S";
 const QString AddressTableModel::Receive = "R";