Arch: consider DraftText objects in the section plane for compatibility

After the reorganization of the Draft Workbench,
the `'DraftText'` objects are now of Proxy.Type `'Text'`.
In the `DraftAnnotation` class the `__setstate__` method
was defined to automatically migrate the Type.

The `Arch SectionPlane` only handles `'Text'` objects. If for
some reason there is still an old `'DraftText'` object
which has not been migrated to the new Type, it won't be found.
This is corrected by adding `'DraftText'` to the list of objects
to process.

src/Mod/Arch/ArchSectionPlane.py

@@ -368,7 +368,7 @@ def getSVG(source,
     for o in objs:
         if Draft.getType(o) == "Space":
             spaces.append(o)
-        elif Draft.getType(o) in ["AngularDimension","LinearDimension","Annotation","Label","Text"]:
+        elif Draft.getType(o) in ["AngularDimension","LinearDimension","Annotation","Label","Text", "DraftText"]:
             if isOriented(o,cutplane):
                 drafts.append(o)
         elif o.isDerivedFrom("Part::Part2DObject"):