Implement query-block overrides to support orderBy=rand

[bobbingwide]

There are a couple of pages where I want to demonstrate the query-block but with orderBy=rand, which translates to orderby=rand in the query.

Requirement

• Easily add capability to sort query results randomly
• Don't worry about pagination.

Solution

• [ ] Implement an override to the orderBy field when the className on the query block is 'rand'
• [ ] Set the Additional CSS class(es) to 'rand' for those queries which need to be displayed randomly.