Case List: Custom XPath

[dannyroberts]

Create a custom-xpath detail column type that allows the user to specify the xpath to use (using '.' for the raw value).

This would mean

• add a type in the UI with a box for typing in the xpath
• create a FormattedDetailColumn example subclass that returns the dot-interpolated xpath as the template xpath
  • see example for dot-interpolation
  • see example for how to override the template xpath

(Note if this code has changed since I wrote wrote this spec, and the links no longer make sense, feel free to fix!)

When Max referred to the format he called it "Calculation".

The UI should look similar to the filter UI below.