still have to split viewprovider from object.
[Draft] Dimension Style code cleanup
thx @vocx-fc for reviewing
further cleanup
[Draft] Dimension Style improvements
Added a property to the dimension object to link the dimension style.
Improved the update of dimensions when style changes. This can be done in 2 different ways: by setting AutoUpdate property to True or by activating Update function from the viewprovider context menu.
Previously, the arc was entirely created in the GuiCommand
definition. The code to create only the arc is placed inside
a module so that the function can be used in scripting
from the terminal, without a graphical interface.
Inside the class `_DraftLink` the `onDocumentRestored` function
tests for the existence of the old attribute `useLink`. If it is
present, it uses it to define the new variable name `use_link`.
This is done use Python naming conventions.
The old `useLink` is deleted so it is not longer saved
together with the object when the document is saved.
It replaces the older `Draft_Array` command, and provides
a task panel to select the properties, similar to the
`Draft_PolarArray` and `Draft_CircularArray` commands.
It can also create `App::Links` directly from this task
panel, so it also replaces the `Draft_LinkArray`
introduced by the LinkMerge.
