Draft: fix bspline and bezcurve viewproviders

Finished to fix bspline and bezcurve wiewproviders.

src/Mod/Draft/CMakeLists.txt

@@ -113,7 +113,7 @@ SET(Draft_objects
 SET(Draft_view_providers
     draftviewproviders/__init__.py
     draftviewproviders/view_base.py
-    draftviewproviders/view_bezier.py
+    draftviewproviders/view_bezcurve.py
     draftviewproviders/view_bspline.py
     draftviewproviders/view_circulararray.py
     draftviewproviders/view_clone.py

src/Mod/Draft/Draft.py

@@ -222,15 +222,15 @@ if FreeCAD.GuiUp:
 from draftmake.make_bspline import make_bspline, makeBSpline
 from draftobjects.bspline import BSpline, _BSpline
 if FreeCAD.GuiUp:
-    # for compatibility with older versions
-    _ViewProviderBSpline = ViewProviderWire
+    from draftviewproviders.view_bspline import ViewProviderBSpline
+    from draftviewproviders.view_bspline import _ViewProviderBSpline
 
 # bezcurve
 from draftmake.make_bezcurve import make_bezcurve, makeBezCurve
 from draftobjects.bezcurve import BezCurve, _BezCurve
 if FreeCAD.GuiUp:
-    # for compatibility with older versions
-    _ViewProviderBezCurve = ViewProviderWire
+    from draftviewproviders.view_bezcurve import ViewProviderBezCurve
+    from draftviewproviders.view_bezcurve import _ViewProviderBezCurve
 
 # clone
 from draftmake.make_clone import make_clone, clone

src/Mod/Draft/draftmake/make_bezcurve.py

@@ -36,7 +36,7 @@ from draftutils.translate import translate
 
 from draftobjects.bezcurve import BezCurve
 if App.GuiUp:
-    from draftviewproviders.view_bezier import ViewProviderBezCurve
+    from draftviewproviders.view_bezcurve import ViewProviderBezCurve
 
 
 def make_bezcurve(pointslist, closed=False, placement=None, face=None, support=None, degree=None):

src/Mod/Draft/draftviewproviders/view_bezcurve.py

@@ -36,3 +36,6 @@ class ViewProviderBezCurve(ViewProviderWire):
 
     def __init__(self, vobj):
         super(ViewProviderBezCurve, self).__init__(vobj)
+
+
+_ViewProviderBezCurve = ViewProviderBezCurve

src/Mod/Draft/draftviewproviders/view_bspline.py

@@ -36,3 +36,6 @@ class ViewProviderBSpline(ViewProviderWire):
 
     def __init__(self, vobj):
         super(ViewProviderBSpline, self).__init__(vobj)
+
+
+_ViewProviderBSpline = ViewProviderBSpline