The "Transform" and "Set Colors..." context menu items did not work on
most Draft objects because the View Provider has a setEdit() function,
which overrides any edit action provided at a higher level (e.g. by
Part). This commit checks the mode of the edit, and if it is not zero,
behaves as though the setEdit() function does not exist, allowing Part
to provide the required context menu behavior.
This includes `view_array`, `view_base`, `view_bezcurve`,
`view_bspline`, `view_circulararray`, `view_clone`, `view_dimension`,
`view_draft_annotation`, `view_draftlink`, `view_facebinder`,
`view_fillet`, `view_label`, `view_orthoarray`, `view_point`,
`view_polararray`, `view_rectangle`, `view_text`, `view_wire`,
`view_wpproxy`.
These are added to the `draftviewproviders` Doxygen group
so that the functions and classes contained in each module
are listed appropriately in the automatically generated
documentation.
The improvements are done to `ViewProviderDraft` which propagates
to the majority of the Draft objects by derived classes
like `ViewProviederWire`.
The initialization of the properties is moved to a method
`_set_properties`. The properties `Pattern` and `PatternSize`
are created only if they do not exist.
This allows calling `ViewProviderDraft(obj.ViewObject)`
to migrate an older object to this viewprovider
but without adding duplicated properties.
In particular, this is done to support the migration of the older
`Fillet` object.
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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