Group dxf relevant files in one folder

src/Mod/Import/App/AppImportPy.cpp

@@ -78,7 +78,7 @@
 #include <Mod/Part/App/PartFeature.h>
 #include <Mod/Part/App/PartFeaturePy.h>
 
-#include "ImpExpDxf.h"
+#include "dxf/ImpExpDxf.h"
 
 namespace Import {
 

src/Mod/Import/App/CMakeLists.txt

@@ -39,10 +39,10 @@ SET(Import_SRCS
     StepShapePyImp.cpp
     PreCompiled.cpp
     PreCompiled.h
-    ImpExpDxf.cpp
-    ImpExpDxf.h
-    dxf.cpp
-    dxf.h
+    dxf/ImpExpDxf.cpp
+    dxf/ImpExpDxf.h
+    dxf/dxf.cpp
+    dxf/dxf.h
 )
 
 SET(SCL_Resources

src/Mod/Import/App/dxf/ImpExpDxf.cpp

@@ -20,7 +20,7 @@
  *                                                                         *
  ***************************************************************************/
 
-#include "PreCompiled.h"
+#include "../PreCompiled.h"
 
 #ifndef _PreComp_
 #endif

src/Mod/Import/App/dxf/dxf.cpp

@@ -3,7 +3,7 @@
 // This program is released under the BSD license. See the file COPYING for details.
 // modified 2018 wandererfan
 
-#include "PreCompiled.h"
+#include "../PreCompiled.h"
 
 //required by windows for M_PI definition
 #define _USE_MATH_DEFINES

src/Mod/TechDraw/App/AppTechDrawPy.cpp

@@ -60,7 +60,7 @@
 #include <Mod/Part/App/TopoShapeCompoundPy.h>
 #include <Mod/Part/App/OCCError.h>
 
-#include <Mod/Import/App/ImpExpDxf.h>
+#include <Mod/Import/App/dxf/ImpExpDxf.h>
 
 #include "DrawProjectSplit.h"
 #include "DrawViewPart.h"