[TD] DrawView*: remove unused includes - part 1

- also sort includes
- also additions to precompiled header

src/Mod/TechDraw/App/DrawView.cpp

@@ -20,36 +20,29 @@
  *                                                                         *
  ***************************************************************************/
 
-
 #include "PreCompiled.h"
 
 #ifndef _PreComp_
+# include <cmath>
 # include <sstream>
 # include <Standard_Failure.hxx>
-#include <Precision.hxx>
-#include <cmath>
+# include <Precision.hxx>
 #endif
 
-
 #include <App/Application.h>
 #include <App/Document.h>
-#include <Base/Writer.h>
-#include <Base/Reader.h>
-#include <Base/Exception.h>
-#include <Base/FileInfo.h>
 #include <Base/Console.h>
-#include <Base/UnitsApi.h>
-
-#include "DrawPage.h"
-#include "DrawViewCollection.h"
-#include "DrawViewClip.h"
-#include "DrawLeaderLine.h"
-#include "Preferences.h"
-#include "DrawUtil.h"
-
+#include <Base/Reader.h>
 #include <Mod/TechDraw/App/DrawViewPy.h>  // generated from DrawViewPy.xml
 
 #include "DrawView.h"
+#include "DrawLeaderLine.h"
+#include "DrawPage.h"
+#include "DrawUtil.h"
+#include "DrawViewClip.h"
+#include "DrawViewCollection.h"
+#include "Preferences.h"
+
 
 using namespace TechDraw;