Also fix the name of certain functions.
Do not import `DraftFillet` any more as it's just kept
for compatibility purposes.
Do not test OCA nor AirfoilDAT as it's very improbable
that these formats will gain more support any time soon.
Remove the make function that creates the old object,
its corresponding Gui Command, and the old `DraftFillet.Fillet`
proxy class, which now is a redirection to the new `Fillet`
class defined in `draftobjects.fillet`.
Also change the unit test, and the `draft_test_object` script
to run `Draft.make_fillet`.
Also import it in the `Draft` namespace so that is available
as `Draft.make_arc_3points`.
Use this new function in the unit test `drafttests.test_creation`,
in the GuiCommand `draftguitools.gui_arcs`, and in the
`draft_test_objects` script.
This solves a small bug in the radial dimension
unit test introduced in 81c2896928, where a circle shape
is used before it is recomputed.
```
drafttests/test_creation.DraftCreation.test_dimension_radial
```
Previously the `makeAngularDimension` function produced
error messages in the report view due to internal rounding
of `App::PropertyAngles`.
This was fixed in `Base::Quantity`, which now supports
Python's `__round__` function.
