Fixes #3260. Enables setting the target field for the trigger API to a form context an arbitrary number of levels above the current field by prepending the field name with `^` for each level to go up. For instance, if you had a field [allow_pictures] in the base form and a [records] repeater with [image] fields, and you set the target field for the trigger on [image] to [^allow_pictures] then it would work properly instead of looking for an [allow_pictures] field on the [records] field. Credit to @MartynasJanu. Documented in
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