This change ports the JavaScript side of the config forms app to use

TypeScript and spina.
For the most part this is a very straightforward port. The only annoying

thing was I discovered that the ListItem implementation allowed

passing in an actions parameter which was treated as an option arg,

but was actually being passed in as part of the attributes (despite not

being an attribute on the model). This was only used inside of our unit

tests (which have themselves been updated to use setActions), but I've

added some compatibility code to emit a deprecation warning just in the

very unlikely case that someone was using this.

Ran js-tests.