Pykechain

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This is release :100: of pykechain! That means :cake:!

* :bug: Fixed a bug where the API parameters for the `Service` now includes additional attributes on its objects. 709. Thanks to bastiaanbeijer and raduiordache for finding it and jelleboersma for providing the fast resolution.

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* :bug: Fixed a bug in the multi references property where the call made to the backend with a normal user would require more information than only the id's of the parts, this resulted in an API error in the retrieval of the referred instances. 707 Thanks BastiaanBeijer for the discovery and JelleBoersma for the quick fix.
* :bug: `child()` method of Part2 now robustly retrieves child parts created after retrieval of the parent itself, regardless of the `_cached_children`.

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* :bug: Default widget title is now respected when widgets are created with `title=False`.
* :+1: Improved typing of `TreeObject` methods in its subclasses.

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This release brings some interesting changes to pykechain. We discovered suddenly that the `Activity` and `Part` where actual trees, being a sustainable company, we also implemented them as such. You will find additional helper methods on both models such as `child()`, `all_children()`, and `siblings()`. This release also bring many small updates from two 'bug hunting' pull requests.

* :star: Creation of `Widgets` without a title but with a reference (or `ref`) now supported via the `show_title_value` keyword.
* :star: Implemented `child` method for `Part2` and `Activity2` class. Also implemented "dunder" method `__call__()` as short-hand for `child()`, making tree searching much simpler to code, e.g: `child = root('part')('child')`
* :star: Creation of `Widgets` without a title but with a reference (or `ref`) now supported via the `show_title_value` keyword.
* :star: Added `Association` class and retrieval method `associations()` on the `Client` class.
* :bug: Creation of `Activity` now uses parent's `classification` if provided.
* :+1: Deprecated `get_all_children` helper function. It is replaced by the `all_children` method on the `Part2` and `Activity2` classes.
* :+1: Added `classification` attribute to the `Part2` class.
* :+1: Added caching of children to the `Activity2.children()` method.
* :+1: Moved creation of WidgetsManager instances from the `widgets()` method of the Client to Activity class. The Client's method output is now consistent with the `create_widget(s)` methods. 693
* :+1: Moved `delete_widget(s)` methods from WidgetsManager to Client class.
* :+1: Refactored Widget's `delete` method to now calls its WidgetManager, if available, to maintain a consistent Widget list.
* :+1: Added `__contains__` method to WidgetsManager to support "widget in manager" comparisons.
* :+1: Creation of `Activity` now uses parent's `classification` if provided.
* :+1: Added `page_size` input to the `add_scope_widget` method of the WidgetManager class to set the pagination of the `Scope` widget.
* :+1: dependent versions for development: sphinx (2.4.3), pre-commit (2.1.0), requests (2.23.0)

Backward incompatible changes
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* The `Client.widgets()` method now returns a list of `Widget` objects. In the past this was a `WidgetsManager` object that contained additional helper/widgetfactory methods to instantiate a widget. This is now brought in line with other `Client` widget methods like `Client.create_widget()`, etc. (reg 693)

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* :star: Added `Client` method for the bulk-update properties API endpoint. 663
* :star: Added `Property2` flag `use_bulk_update` and class method `update_values` to support bulk-update of property values while still using the `value` attribute. 663
* :bug: `has_value` method of the `Property2` class now accurately predicts floats, integers and boolean values. 675
* :bug: `value` attribute of `AttachmentProperty` class now refreshes automatically when uploading attachments. 675
* :+1: moved bulk-update of widgets to the client. Also split the `_validate_widget` and the `_validate_related_models` Client methods. 658
* :+1: Updated `populate_descendants()` to use new API and actually store the `_cached_children`.
* :+1: Added test to confirm a value of `None` clears a reference property. 468
* :+1: Keyword-arguments provided when creating widgets via the `WidgetsManager` do now propagate successfully.
* :+1: Improved unittests for `Property2`, `AttachmentProperty2` classes.
* :+1: dependent versions for development: semver (2.9.1), coveralls (1.11.1), Sphinx (2.4.1), tox (3.14.5)

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* :bug: `Activity2` method `_validate_edit_arguments` now correctly checks for members of the scope prior to assigning new assignees.
* :star: added thousand separators representation on numeric properties to pykechain. 670 (thanks to raduiordache)
* :+1:Fix the `Widget.parent()` method call. 655
* :+1:Updated `populate_descendants()` to use new API and actually store the `_cached_children`. 662
* :+1: dependent versions for development: pydocstlye (5.0.2), nbsphinx (0.5.1), pytest (5.3.5), pre-commit (2.0.1)