Added option to list the names used by each KEEP or BYPASS module
and indicate how used (as reference, in syntax template, etc).
Improved BYPASS; it now gives a list of suggested replacements
(and, optionally, what dependencies each replacement satisfies).
Incompatibly changed exports of macro-debugger/analysis/check-requires;
the new analysis result type is too complicated (and volatile, still)
to document for 0 other clients; focus on the script/output instead.
Removed check-requires-script.rkt.
Updated module whitelist.
Fixed syntax-local-value when identifier later used in def ctx
(destroyed binding information). This manifested as missed references
to modules that does define-local-member-name.
Fixed identifiers without syntax-source-module such as intro'd by
unit-from-context. This manifested as missed references to modules
that provided bindings used by unit-from-context forms.
