Rios-core

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* Fixed inconsistencies with how "required" is enforced with matrix rows and
columns.

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* Added validation logic to prevent the assignment of the standard widget types
to fields of incompatible data types.
* Added validation logic to prevent unknown properties in Instrument
Enumeration definitions.
* Updated ``colander`` dependency to allow more recent versions.

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* Added support for the ``identifiable`` flag on Calculations.
* Added support for the ``meta`` property in Instruments, Calculation Sets,
Forms, and Interactions.
* Enhanced validation of metadata values that are supposed to follow the HTTP
Product Token format.
* Display duplicate IDs and more information in error messages.
* The ``get_full_type_definition()`` function is now officially part of the
public API of this package.

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* Restricted calculation result types to match specification update (removed
enumeration and enumerationSet).
* Fixed issue where form event failure text was not being checked for the
default localization.
* Added validation logic to ensure tag identifiers don't collide with page or
field IDs.
* Added validation logic to ensure tags are unique within an element's list.

==================

* Renamed package to rios.core to follow the rename of the standard from PRISMH
to RIOS.
* Renamed the ``prismh-validate`` command line tool to ``rios-validate``.

==================

* Added validation logic for the standard widget options.
* Added validation logic for the event options.
* Removed support for Unprompted Fields and Calculate Events in Forms to match
changes made to the specification.
* Added validation logic that ensures Assessment enumeration values are allowed
by the Instrument.
* Added validation logic that prevents Form and Interaction Questions from
describing enumeration values that aren't allowed for the field.
* Added validation of Form subfield configurations.
* Improved the accuracy of the locations reported by some errors.