Iommi

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* include=False on a Column should imply not generating the query filter and bulk field. If you want to not render a column but still want the filters, use the render_column=False feature

* Added callbacks for saving a form: `extra__pre_save_all_but_related_fields`, `extra__on_save_all_but_related_fields`, `extra__pre_save`

* Added `extra__new_instance` callback to `Form.create` for custom object creation

* The errors list has been changed. You should always use `add_error()` to add an error on a `Field` or a `Form`

* It is now possible to call `is_valid()` and `get_errors()` and get what you expect from `post_validation` on `Field` and `Form`

* Query forms can now have additional fields, that are ignored by the filter handling code (when you want to do additional filtering outside of the query logic)

* Bug fixes with state leaking between binds

* Fixed jump to code

* Improved error message for `is_valid_filter`

* Added a nice error message if you try to shoot in `style` or `class` as raw strings

* Fixed empty table message, and invalid query form messages

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* The given `rows` queryset and filtering were not respected for the "Select all rows" bulk feature. This could produce some pretty bad bugs!

* Support custom bulk post_handlers on lists and not just querysets

* `Table` has a few new members:
- `initial_rows`: the rows you pass (or that gets created by `auto__model`) is stored unchanged here
- `sorted_rows`: `initial_rows` + sorting applied
- `sorted_and_filtered_rows`: `sorted_rows` + filtering applied
- `visible_rows`: `sorted_and_filtered_rows` + pagination applied
- `rows`: this is now a property and will map to the old behavior which is the "most applied" member that exists


* Fixed passing dunder paths to `auto__include`. You got a weird crash if the target of the path was a foreign key. There are still issues to be resolved adjacent to this, but the base case now works.

* Fixed the "select all" feature for pages with multiple tables.

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* Every part can now have assets that are added to the assets of the style and included in the head. This is particularly useful for bundling small pieces of javascript or css with the components that need them and thereby gets us closer to being able to write truly self contained "component". As a proof of concept I did so for the tables javascript parts. The naming takes care of deduplication of assets.

* Only include select2 assets when needed (possible because of the point above)

* Filtering on booleans was very broken. It always returned empty querysets and didn't produce errors when you tried to do stuff like `my_boolean<3`

* It's now possible to configure stuff on the freetext field of a query

* iommi will now grab the root page title from the text from `Header` instances in addition to `Part.title`

* Render date fields as such

* Fixed date and time formatting

* Support for optgroups in forms

* Make it possible to insert fields into the form of a query, and filters into a query

* Differentiate between primary and other actions. This should make iommi pages look more in line with the majority of design systems. If you have a custom style you probably want to add a style definition for `Action.primary`.

* Fixed a case of a silent overwrite that could be surprising. This was found during reading the code and has never happened to us in practice.

* Style fixes for bulma

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* Fix so that style application does not alter definitions destructively. This could lead to some strange behavior if you tried to switch between styles, and it could leak over definitions between things you would not expect.

* The title of `Table` is `None` when there is no model

* Assets as first class concept. You can now insert asset definitions into your style with `assets__js=...` instead of defining a `base_template`. This change also removes the base templates for all the built in styles as they are now obsolete.

* Made it easy to hide the label of a Field by setting `display_name=None`, or `include=False`

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* Internationalization! iommi now has i18n support and ships with English, German and Swedish languages out of the box. We welcome more translations.

* Out of the box support for the Bulma CSS framework

* Make `auto__include` specifications allow foreign key paths

* By default we now grab display_name from the model fields verbose_name (if applicable)

* Sometimes you got reordering of parts when doing a post to a form for example, this is now fixed

* The `traversable` argument to lambdas is now the leaf and not the root. This was a bug.

* Support `reverse_lazy` as url argument to MenuItem

* Two id attributes were rendered on the input tags in forms (thanks Benedikt Grundmann for reporting!)

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* `delete_object__post_handler` accessed `instance.id` which might be valid. It should have accessed `instance.pk` which is always valid.