feat(editor): add WCFG (Server Config) — 120th open format

Novel replacement for the worldserver.conf / mangosd.conf
flat-text configuration files vanilla server forks
shipped. Each entry binds one configId to its
polymorphic value via the valueKind enum (Float / Int /
Bool / String) — only the matching value field is
authoritative per entry.

The polymorphic value is the novel data shape: each
entry stores ALL three value carriers on disk
(floatValue float / intValue int64 / strValue string),
and valueKind picks which is meaningful at runtime. Bool
folds into intValue with strict 0/1 semantics. JSON
export reflects this: an activeValue derived field
renders the right form per kind so operators editing
JSON see only the relevant value.

Nine configKind values cover the full server-tunable
surface: XPRate / DropRate / HonorRate / RestedXP /
RealmType / WorldFlag / Performance / Security / Misc.
Each kind groups settings the server iterates by kind
at startup (all XPRate entries seed the per-class
experience matrix; all Security entries configure the
anti-cheat thresholds).

Three preset emitters: makeRates (4 vanilla baseline
rate multipliers with valueKind=Float), makePerformance
(4 server tuning configs mixing Int and Float kinds —
max creatures per cell, view distance yards, GC
interval seconds, etc.), makeSecurity (4 anti-cheat
configs FIRST format using valueKind=String for the
cheat-detection sensitivity preset name).

Validator's most novel checks are per-valueKind cross-
field consistency: Bool requires intValue strictly 0/1
(error), and warns on cross-field bleed (Float kind
with non-zero intValue means the int is silently
ignored at runtime but persists on disk). Plus name
uniqueness — server name-based config lookups would
be ambiguous otherwise.

Format count 119 -> 120 (multiple-of-10 milestone).
CLI flag count 1262 -> 1267.

tools/editor/cli_arg_required.cpp

@@ -368,6 +368,8 @@ const char* const kArgRequired[] = {
     "--gen-skp", "--gen-skp-arctic", "--gen-skp-hellfire",
     "--info-wskp", "--validate-wskp",
     "--export-wskp-json", "--import-wskp-json",
+    "--gen-cfg", "--gen-cfg-perf", "--gen-cfg-sec",
+    "--info-wcfg", "--validate-wcfg",
     "--gen-weather-temperate", "--gen-weather-arctic",
     "--gen-weather-desert", "--gen-weather-stormy",
     "--gen-zone-atmosphere",