Create functionality for subquery parameters

[StevenWInfo]

Because the subquery parameter represents a lot of different parts of a query differently than a basic query, it would require rewriting how the functionality for how a query is represented for a lot of different parts. Because I've been working on other parts, and I've wanted to hurry up and make the basic functionality work I've skipped over this part.

It shouldn't be too difficult, but it will probably require a lot of busywork of going through all of the URL parameter representations and making new representations for those that differ.

[StevenWInfo]

I forgot that I already had an issue for this: #10