Closes the JSON round-trip gap on the liquid catalog format
shipped this batch. --export-wliq-json emits all 14 scalar
fields (incl. 3-byte fog RGB) plus a dual int + name form for
liquidKind so hand-edits can use either representation.
--import-wliq-json accepts either form, falling back to the
int when both are present. Verified byte-identical round-trip
on all three preset emitters (starter / magical / hazardous).
716 documented CLI flags.