feat(pipeline): add WSPN (Wowee Spawn Point catalog) format

Novel open replacement for AzerothCore-style scattered
creature_template / gameobject SQL spawn tables PLUS the
ADT MDDF / MODF doodad-placement chunks. The 11th open
format, and the first that covers the live world-content
side (atmosphere + sounds + spawns now form the runtime
"what fills this zone" picture).

A WSPN file holds all spawn points for a zone in a single
table, with kind discriminating creature vs game object
vs static doodad. The same format powers:
  • server runtime  — knows what NPCs / objects to spawn
  • editor          — draws spawn markers
  • renderer        — reads the doodad subset directly to
                       draw static props without going
                       through a server roundtrip

Format:
  • magic "WSPN", version 1, little-endian
  • per entry: kind / entryId / position(3f) / rotation(3f)
    / scale / flags / respawnSec / factionId /
    questIdRequired / wanderRadius / label

Flags packed: disabled (0x01), event-only (0x02),
quest-phased (0x04). Reserved bits for future per-entry
encoding extensions.

API: WoweeSpawnsLoader::save / load / exists; presets
makeStarter (1 each kind), makeCamp (4-bandit ring +
chest + 2 tents), makeVillage (6 NPCs + 2 signs + 4
corner trees).

CLI added (5 flags, 473 documented total now):
  --gen-spawns / --gen-spawns-camp / --gen-spawns-village
  --info-wspn / --validate-wspn

Validator catches: out-of-range kind, NaN/inf coords,
non-positive scale, doodad with non-zero respawn (static
prop misuse), creature with respawn=0 (won't respawn after
kill), entryId=0 (orphan reference).

All 3 presets save / load / re-validate clean. Doodad and
game-object entries explicitly set wanderRadius=0 so the
generated catalogs are noise-free.

tools/editor/cli_arg_required.cpp

@@ -29,6 +29,8 @@ const char* const kArgRequired[] = {
     "--gen-sound-catalog-tavern",
     "--info-wsnd", "--validate-wsnd",
     "--export-wsnd-json", "--import-wsnd-json",
+    "--gen-spawns", "--gen-spawns-camp", "--gen-spawns-village",
+    "--info-wspn", "--validate-wspn",
     "--gen-weather-temperate", "--gen-weather-arctic",
     "--gen-weather-desert", "--gen-weather-stormy",
     "--gen-zone-atmosphere",