Switch to using lodash instead of underscore
Underscore has been deprecated for a while in favour of lodash, this MR simply updates everything to use v4.13.1 of the lodash library.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Underscore has been deprecated for a while in favour of lodash, this MR simply updates everything to use v4.13.1 of the lodash library.