feat(editor): add WSCD (Spell Cooldown Category) open catalog format

Open replacement for SpellCooldown.dbc plus the per-spell
category-cooldown fields in Spell.dbc. Defines the shared-cooldown
buckets that related spells reference: casting one spell triggers
a cooldown on every other spell in the same bucket. Mage Polymorph
variants (Sheep / Pig / Turtle / Cat) all share one bucket so
morphing a target locks all variants at once. Healing potions and
mana potions share the SharedWithItems bucket so consuming one
locks the other.

Distinct from WSDR (which times how long an aura stays on a
target) — WSCD times how long before a spell can be cast again.
The global cooldown (GCD) is itself just one bucket of this kind,
flagged with OnGCDStart so the engine triggers it at cast start
rather than cast finish.

Three preset emitters: --gen-cdb (4 baseline buckets including
GCD), --gen-cdb-class (5 mage-specific class cooldowns including
the Polymorph family), --gen-cdb-items (5 item cooldowns
including the heal/mana potion shared bucket and the 60min
Hearthstone family). Validation enforces id+name presence,
bucketKind 0..4, no duplicate ids, and warns on Global without
OnGCDStart (engine wouldn't trigger on cast start) and Spell
kind with SharedWithItems (contradictory).

categoryFlags is a bitfield (AffectedByHaste / SharedWithItems /
OnGCDStart / IgnoresCooldownReduction); --info-wscd decodes the
bits to label list. Wired through the cross-format table; WSCD
appears automatically in all 9 cross-format utilities. Format
count 70 -> 71; CLI flag count 907 -> 912.

tools/editor/cli_list_formats.cpp

@@ -95,6 +95,7 @@ constexpr FormatRow kFormats[] = {
     {"WSRG", ".wsrg",  "spells",    "SpellRange.dbc + per-spell range", "Spell range bucket catalog"},
     {"WSCT", ".wsct",  "spells",    "SpellCastTimes.dbc + cast scaling","Spell cast time bucket catalog"},
     {"WSDR", ".wsdr",  "spells",    "SpellDuration.dbc + per-spell dur","Spell duration bucket catalog"},
+    {"WSCD", ".wscd",  "spells",    "SpellCooldown.dbc + shared cd grp","Spell cooldown category catalog"},
 
     // Additional pipeline catalogs without the alternating
     // gen/info/validate CLI surface (loaded by the engine