These modules provide supporting functions for dealing
with the scripted objects and Gui Commands defined
within the workbench.
If the functions do very basic tasks or are too generic,
they are more appropriate inside the `draftutils` package.
These function are imported in the main `Draft.py` module
so they form part of the public programming interface (API)
of the workbench.
Remove trailing spaces in CMakeLists.txt.
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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