Add some usability options to object functions.

Add option "exact" (boolean) to OBJECT_PATHS, OBJECT_PAIRS_NESTED & OBJECT_FILTER as a short-cut for regular expression start/end anchors (and permit the same criteria when not using a regular expression).

Add "report" option ("field" or "path") to OBJECT_PAIRS_NESTED to control what is reported in the "name" field of the output.  This is to help with indexing a field that could appear at any depth within an object.