[TD] ViewProviders: remove unused includes

- also sort the includes

src/Mod/TechDraw/Gui/ViewProviderLeader.cpp

@@ -29,26 +29,11 @@
 # include <QTextStream>
 #endif
 
-#include <QMessageBox>
-
-/// Here the FreeCAD includes sorted by Base,App,Gui......
-#include <Base/Console.h>
-#include <Base/Parameter.h>
-#include <Base/Exception.h>
-#include <Base/Sequencer.h>
-
-#include <App/Application.h>
-#include <App/Document.h>
 #include <App/DocumentObject.h>
-
 #include <Gui/Application.h>
-#include <Gui/BitmapFactory.h>
 #include <Gui/Control.h>
-#include <Gui/Command.h>
-#include <Gui/Document.h>
 #include <Gui/MainWindow.h>
 #include <Gui/Selection.h>
-#include <Gui/ViewProviderDocumentObject.h>
 
 #include <Mod/TechDraw/App/LineGroup.h>
 #include <Mod/TechDraw/App/DrawLeaderLine.h>
@@ -56,8 +41,6 @@
 #include <Mod/TechDraw/App/DrawWeldSymbol.h>
 
 #include "PreferencesGui.h"
-#include "MDIViewPage.h"
-#include "QGVPage.h"
 #include "QGIView.h"
 #include "TaskLeaderLine.h"
 #include "ViewProviderLeader.h"