Convert CAPA inputtype statuses from strings to objects, in order to
simplify css class management and internationalization of status strings
(potentially) displayed to the user.
Revert "remove location of item from loc_mapper and cache"

This reverts commit d2b8b4f0dd43cfec379b2e12cc9f723ee0fab7d6.
Merge pull request #3515 from edx/zub/revert/std1441/deleteitemfromlocmapper

Revert "remove location of item from loc_mapper and cache"
Merge pull request #3002 from edx/dcs/status-object

Convert CAPA inputtype statuses from strings to objects,