[Qt] include and file header cleanup

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

src/qt/sendcoinsdialog.h

@@ -14,14 +14,14 @@ class OptionsModel;
 class SendCoinsEntry;
 class SendCoinsRecipient;
 
-QT_BEGIN_NAMESPACE
-class QUrl;
-QT_END_NAMESPACE
-
 namespace Ui {
     class SendCoinsDialog;
 }
 
+QT_BEGIN_NAMESPACE
+class QUrl;
+QT_END_NAMESPACE
+
 /** Dialog for sending bitcoins */
 class SendCoinsDialog : public QDialog
 {