Render tag UDFs in the Reference Tagging view

[munnsmunns]

Lays the groundwork for using User Defined Forms that are bound to Reference Tags.

• Adds TagUDFContent model
• Shows matching Tag UDFs when tagging references
• Tag forms can be collapsed by clicking on the header

TODO:

• Consider how tag UDF deletions should be managed

Example of displayed Tag UDF:

[shapiromatron]

Nice work @caseyhans and @munnsmunns! This was a really complicated implementation, great job figuring out how to pass static HTML forms and dynamically inject values in/out. There are a few oddities with how it had to be done (sending data to/from as arrays of values, checking for multiple choice fields on the backend), but I couldn't figure out a better way to do it, so I put some TODOs for future thinking on other ways to improve. That said, I put it through a number of tests, and it worked great.

I did one major refactoring on the JS side to try to separate out the UDF code as much as I could. I tried to break out the individual changes as much as I could for review of my changes.

• 2e16ca6 cleanup from code review (16 minutes ago) {Andy Shapiro}
• 68bfe49 fix integration test (32 hours ago) {Andy Shapiro}
• 50127cf separate udf js components (2 days ago) {Andy Shapiro}
• 7932aa2 move udf component to separate file (2 days ago) {Andy Shapiro}
• efe4065 restore fix for multiple choice (2 days ago) {Andy Shapiro}
• 5a0da97 rewrite udf form save code (2 days ago) {Andy Shapiro}
• 5c30756 move clear form code to helper method (2 days ago) {Andy Shapiro}
• 84b08cd build css class instead of inline (2 days ago) {Andy Shapiro}
• 7fbba2c remove cachable if it cant be unset (3 weeks ago) {Andy Shapiro}
• a888810 more language refinement (3 weeks ago) {Andy Shapiro}
• 57bc5a4 minor edits (3 weeks ago) {Andy Shapiro}
• abe4509 add tag form cache (3 weeks ago) {Andy Shapiro}