[Qt] include and file header cleanup

- alphabetical ordering
- correct ordering own headers before normal headers etc.

src/qt/optionsdialog.cpp

@@ -17,11 +17,13 @@
 #include "main.h" // for MAX_SCRIPTCHECK_THREADS
 #include "netbase.h"
 #include "txdb.h" // for -dbcache defaults
+
 #ifdef ENABLE_WALLET
 #include "wallet.h" // for CWallet::minTxFee
 #endif
 
 #include <boost/thread.hpp>
+
 #include <QDir>
 #include <QIntValidator>
 #include <QLocale>