Support reference types in array type

[pflans]

Currently the form builder doesn't support adding a reference to a definition within an array type. Adding support for this seems trivial but brings up a nasty bug that should be remedied before the change can be implemented.

Adding ...referenceInputs, to defaultFormInputs (line 163 in arrayInputs.js) will allow this functionality but will also introduce a circular dependency bug if the user creates an array in definitions then tries to use that definition as a reference within the same array. This will crash the browser with a "Maximum Call Stack Size Exceeded" error.