These style properties are used by `ViewProviderDraftAnnotation`
and by the Gui Command `Draft_AnnotationStyleEditor`.
Therefore, they are moved from `draftguitools.gui_annotationstyleeditor`
module to the `draftutils.utils` module, so that they
are in a central location where they won't cause circular
dependencies.
Introduced in d087ccfa54, 7aa42a4406, 1e8d5d0355.
Make it PEP8 compliant, and shorten line lengths.
It is based on `GuiCommandSimplest` to inherit basic behavior
such as `IsActive` returning `True` when a document exists.
