Several JS resource models now have support for fetching raw text fields

and storing them as attributes on the model. This will be used by

Markdown editors to load the raw text for editing while using HTML or

Markdown-escaped for display.
The models can now have includeRawTextFields set to trigger the storage

of the raw fields, which will be stored as the rawTextFields attribute.
Along with this, we now always set the richText fields based on the raw

values, and not the forced values, since we only care about the former.
On top of this, there's also a bug fix for allowing the values in extraQueryArgs

to be overridden for requests.

Unit tests pass.
Tested this along with some upcoming changes and saw that the parameters

were being passed in all cases I cared about, and the correct results

came in.