This updates all of WebAPIResource to add typing for methods,

attributes, and local variables, improving code maintenance.
Some logic and typing errors were discovered throughout all this, and

those have now been fixed.
The typing work has also uncovered potential issues with positional vs.

keyword arguments in many of our calls. To resolve this, we'll

eventually need to do away with positional arguments passed to the view,

but that would be a completely separate body of work not planned for

this release.

Unit tests pass.