These modules provide the functions that are used to create
the scripted objects defined within the workbench.
The functions import and use the proxy classes
and viewprovider classes in `draftobjects`
and `draftviewproviders`.
These functions are imported in the main `Draft.py` module
so they form part of the public programming interface (API)
of the workbench.
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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