[Qt] header group cleanup

- seperate core from GUI headers where this was missing
- remove an unneeded new-line

src/qt/recentrequeststablemodel.cpp

@@ -5,9 +5,10 @@
 #include "recentrequeststablemodel.h"
 
 #include "bitcoinunits.h"
-#include "clientversion.h"
 #include "guiutil.h"
 #include "optionsmodel.h"
+
+#include "clientversion.h"
 #include "streams.h"
 
 #include <boost/foreach.hpp>