Add DraftObject and ViewProviderDraft to serve as
the parent classes of all Draft objects
and all Draft view providers.
Inside `Draft.py` we need to import
`_DraftObject` from `draftobjects.base`;
and `_ViewProviderDraft`, `_ViewProviderDraftAlt`,
and `_ViewProviderDraftPart` from `draftviewproviders.view_base`.
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The code is kept for historical reasons, but the tool
is no longer accessible from the toolbars or menus,
as it was superseded by the three commands `Draft_OrthoArray`,
`Draft_PolarArray` and `Draft_CircularArray`.
Also, finally the command is removed from the toolbar
as the Drawing Workbench is obsolete since v0.17.
The command is still loaded and defined by the workbench
but it is no longer presented to the user interface in the menu
or toolbar.
The scale operation can be used with subelements, vertices
and edges, but in this case this only works with polylines
(wires) because internally the functions `scaleVertex`
and `scaleEdges` only work with polylines that have a `Points`
property.
When doing a copy and scale, it also calls `copyScaledEdges`
which calls `joinWires`, so problems with joining wires
may also be present when performing this operation.
Occasionally it fails to join lines even if the lines
visually share a point.
This is a rounding error in the comparison of the shared point;
a small distance will result in the points being considered
different and thus the lines not joining.
The solution is to test properly the two points using
`DraftVecUtils.equals` which considers the value of
the `precision` set in the Draft preferences.
Also fix an error in determining the objects of type group.
Also call `finish` to properly terminate the command,
otherwise it stays active and behaves incorrectly.
