Document previously undocumented classes and functions.

Any fieldset ancestor that is disabled is now checked for an input's
disabled state.

The image input type is just a graphical submit button.

The value attribute of fields expect a string. We use a sentinel value
to clear the field.

Add options for getFormValues, setFormValues, and clearFormValues to allow managing of values for disabled elements.

The clearFormValues method is implemented to be able to clear form
values for selected fields.

Tests are now separated from pre-submit to querying the submitter.

Specify options to their respective input types.

Include all input types for testing.

Add behavior for dirname, isindex, _charset_ scenarios.

Improve test syntax.

Isolate generic input setting value to its own function.

Include all tests for the primary functions as well as the utilities.

Make input type handling more comprehensive.

Only keep lines that are testable.

Make tests more comprehensive.

Include tests for duplicate values, as well as comprehensive date tests.

Reduce complexity in code by un-nesting ternary statements.

Correctly set fields when they are arrays.

Indicate partial values can be passed in setFormValues().

Make error messages more user-friendly. Also remove magic constants
within functions.

Include month and week input types.

Implement setFormValues for easy setting of fields.

Also migrated to pridepack because tsdx is already unmaintained.

Use correct logic.

Switch order in appearance of definitions.

The tests do not depend on separate files for loading templates. This is
for the layouts to be defined alongside the tests for easier updates.

The methods have been refactored and documented for ease of use of the
consumers.

Handle selects, as well as file uploads.

Attempt to unify tests for Jest and Cypress.

Both the JSDOM and the Cypress tests are organized.

This commit adds Cypress for testing the library against a real DOM.

Use custom JSDOM apart from Jest's built-in JSDOM instance because
we need to test different kinds of documents.

We will need to address problems with types, e.g. for `RadioNodeList`
because the runner could not find its declaration (for both our custom
and built-in JSDOM instances).

Add files from TSDX.