Tri.form

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* Fixed cases where from_model lost the type when inheriting

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* Make `Field` shortcuts compatible with subclassing. Previous fix didn't work all the way.

* Use the new major tri.declarative, and update to follow the new style of class member shortcuts

* Major fixes to how `from_model` works. Subclassing `Form` and `Field` now works like you'd expect. This is a breaking change.

* Removed `Field.comma_separated` shortcut. This was never used, and poorly tested.

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* Make `Field` shortcuts compatible with subclassing

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* Fix that Django's DoesNotExist events don't leak out of the field-validation code

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* If you subclass Form this custom class is now used properly in the `from_model` code paths

* `Form` now has a refinable attribute `field_class` which you should use to point to your `Field` subclass if you have one. This is best accomplished in the `Meta` class on the class inheriting from `Form`.

* Added `Form.create_or_edit_object` that will respect your subclass if you have one.

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* Fixed escaping bug introduced in 5.2.0: You could get a KeyError crash if you had `{` and `}` in attributes.