Base: fix Matrix4D::hasScale

* If all column vectors of the 3x3 sub-matrix are equal the function incorrectly claims that it's uniform scaling.
* Detect also non-uniform scaling and if was applied from the left or right side
* Replace the int with an enum and expose it to Python
* Add several new unit tests

src/Mod/Draft/draftutils/gui_utils.py

@@ -154,7 +154,7 @@ def autogroup(obj):
                 # do not autogroup if obj points to active_part to prevent cyclic references
                 return
             matrix = parent.getSubObject(sub, retType=4)
-            if matrix.hasScale() == 1:
+            if matrix.hasScale() == App.ScaleType.Uniform:
                 err = translate("draft",
                                 "Unable to insert new object into "
                                 "a scaled part")