feat(editor): add WQT JSON round-trip authoring workflow

Closes the WQT open-format loop with --export-wqt-json /
--import-wqt-json, mirroring the WOL/WOW/WOMX/WSND/WSPN/
WIT/WLOT/WCRT JSON pairs. All 9 binary formats added since
WOL now have full JSON round-trip authoring.

Each quest round-trips:
  • 13 scalar fields (id, level range, masks, chain links,
    giver/turnin, xp + money reward, flags)
  • 3 string fields (title, objective, description)
  • objectives array with dual int + name kindName
  • rewardItems array with dual int + name pickFlagsList

The flag bitset emits string-array form so a hand-author can
write ["daily", "repeatable", "auto-accept"] instead of
having to remember the bit math. The objective kindName
makes "visit/collect/kill" obvious without needing to know
that kind=3 means VisitArea.

Verified byte-identical round-trip on the 3-quest chain
preset (full feature exercise: prev/next chain links,
mixed objective kinds, AutoComplete bridge quest, player-
choice rewards). Adds 2 flags (509 documented total now).

tools/editor/cli_arg_required.cpp

@@ -43,6 +43,7 @@ const char* const kArgRequired[] = {
     "--export-wcrt-json", "--import-wcrt-json",
     "--gen-quests", "--gen-quests-chain", "--gen-quests-daily",
     "--info-wqt", "--validate-wqt",
+    "--export-wqt-json", "--import-wqt-json",
     "--gen-objects", "--gen-objects-dungeon", "--gen-objects-gather",
     "--info-wgot", "--validate-wgot",
     "--gen-weather-temperate", "--gen-weather-arctic",