Arch: use the new Draft trackers module

Previously it was `DraftTrackers.py`.
Now we import the trackers from `draftguitools/gui_trackers.py`.

src/Mod/Arch/ArchPanel.py

@@ -26,6 +26,7 @@ if FreeCAD.GuiUp:
     from PySide import QtCore, QtGui
     from DraftTools import translate
     from PySide.QtCore import QT_TRANSLATE_NOOP
+    import draftguitools.gui_trackers as DraftTrackers
 else:
     # \cond
     def translate(ctxt,txt):
@@ -180,7 +181,7 @@ class CommandPanel:
         # interactive mode
         if hasattr(FreeCAD,"DraftWorkingPlane"):
             FreeCAD.DraftWorkingPlane.setup()
-        import DraftTrackers
+
         self.points = []
         self.tracker = DraftTrackers.boxTracker()
         self.tracker.width(self.Width)

src/Mod/Arch/ArchStructure.py

@@ -29,6 +29,8 @@ if FreeCAD.GuiUp:
     from PySide import QtCore, QtGui
     from DraftTools import translate
     from PySide.QtCore import QT_TRANSLATE_NOOP
+    import ArchPrecast
+    import draftguitools.gui_trackers as DraftTrackers
 else:
     # \cond
     def translate(ctxt,txt):
@@ -247,7 +249,7 @@ class _CommandStructure:
         # interactive mode
         if hasattr(FreeCAD,"DraftWorkingPlane"):
             FreeCAD.DraftWorkingPlane.setup()
-        import DraftTrackers,ArchPrecast
+
         self.points = []
         self.tracker = DraftTrackers.boxTracker()
         self.tracker.width(self.Width)

src/Mod/Arch/ArchWall.py

@@ -26,6 +26,7 @@ if FreeCAD.GuiUp:
     from PySide import QtCore, QtGui
     from DraftTools import translate
     from PySide.QtCore import QT_TRANSLATE_NOOP
+    import draftguitools.gui_trackers as DraftTrackers
 else:
     # \cond
     def translate(ctxt,txt, utf8_decode=False):
@@ -232,7 +233,7 @@ class _CommandWall:
 
         if not done:
             # interactive mode
-            import DraftTrackers
+
             self.points = []
             self.tracker = DraftTrackers.boxTracker()
             if hasattr(FreeCAD,"DraftWorkingPlane"):

src/Mod/Arch/ArchWindow.py

@@ -27,6 +27,7 @@ if FreeCAD.GuiUp:
     from PySide import QtCore, QtGui, QtSvg
     from DraftTools import translate
     from PySide.QtCore import QT_TRANSLATE_NOOP
+    import draftguitools.gui_trackers as DraftTrackers
 else:
     # \cond
     def translate(ctxt,txt):
@@ -653,7 +654,7 @@ class _CommandWindow:
         # interactive mode
         if hasattr(FreeCAD,"DraftWorkingPlane"):
             FreeCAD.DraftWorkingPlane.setup()
-        import DraftTrackers
+
         self.tracker = DraftTrackers.boxTracker()
         self.tracker.length(self.Width)
         self.tracker.width(self.Thickness)