Pykechain

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* Fixed a lingering performance issue with `Part.add_with_properties()`. In older KE-chain API versions a full part refresh was needed in order to re-retrieve the attributes of a `Part`. In the current backend API this is not needed anymore. The attribute that caused this was the `refresh` flag in the `Part.add_with_properties` method call and resulted in the re-retrieval of all children of a part and caused longer cycle times once the list of children grows longer (linear). This flag will be deprecated in the next release. Currently all Parts are automatically refreshed with information from the backend in a lightweight manner (without an extra API call). The part just created with the method `add_with_properties` is added to the `Part`'s children automatically if the children of the parent are already once retrieved (and cached). Many thanks to our committed users / customers for finding this and pointing this out.
* Updated type hinting for all methods for `Part2` objects, to assist the user in capable Python Development Environments (IDE's - such as Pycharm or VSCode) to write error-free code.
* Added a Pending Deprecation Warning when setting the `refresh` attribute on the `Part.add_with_properties(refresh=False/True)`. It will be removed in version 3.4 and an DeprecationWarning Exception will be raised then.

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* Added scope widget button customization in the `WidgetManager` method `add_scope_widget`.
* Added native KE-chain pages as option for the `Card` widget `link` value. Use the `KEChainPages` enum to set your target.
* Added `show_images` to the inputs of `add_supergrid_widget` and `add_filteredgrid_widget` methods.
* Organized function headers of the `WidgetManager` methods to match the order of the inputs.
* Added `edit_cascade_down` method to the `Activity2` class to trickle-down the changes to the attributes of a subprocess.
* Added `APP` classification options to the tasks to actively work on the `APP` screens (not end-user editable)
* Added support of Python 3.7 and 3.8 in sim scripts to support future unlocking of this feature in KE-chain 3.2 (FEB20).

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* Feature: migrating `async` to `async_mode` for all backend api's for future compatibility. Determines if backend lives on version 3.1.0 or above. (649)
* dependent versions for development: coveralls (1.10.0), Sphinx (2.3.1), mypy (0.761), tox (3.14.3), pre-commit (1.21.0)

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* :bug: copying of (multiple) `1-or-many` `Part` models to the same parent is now fixed. 636 Thanks to jelleboersma
* :bug: copy/move of a `Part` also refreshes the part to ensure all properties are copied/moved. 636
* :point_up: dependent versions for development: pytest (5.3.2), coverage (pinned to < 5.0), Sphinx (2.3.0), mypy (0.760)

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* made `Activity.associated_parts()` great again. 523 Thanks to raduiordache
* Added also the possibility to get the associated objects of an `Activity` with ids only. 523
* Updated dependent versions for development: pydocstyle (5.0.1)

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This is the day after 'Sinterklaasavond' :gift: edition of pykechain.

* Update the `Client.create_widgets` (bulk create widgets) and `Client.update_widgets_associations` (bulk update widget associations) to work seamlessly with the backend on it as we discovered a bug in the backend during tests of these methods. Additional tests where added as well. 617, 626
* Added `SideBarManager` and `SideBarButton` classes to support configuration of the scope side-bar. 539
* Added Enumeration classes `KEChainPages`, `SubprocessDisplayMode`, `URITarget` and `FontAwesomeMode` to support configuration of the scope side-bar. 539
* Added `is_url` url checker, with a tap to the :tophat: for Konsta Vesterinen and his implementation of an URL validator. 539
* Added pre commit hooks for developers. Use `pre-commit install` to install the hooks in your local repo and while committing, watch your git console (in Pycharm in the 'Version Control' tab (bottom) > 'Console' tab). If you want to run the pre-commit hooks on all files (not only those ones that changes in the commit) run `pre-commit run -a` on the command line (Terminal).