feat(editor): add WMAT (Item Material) open catalog format

Open replacement for Blizzard's Material.dbc plus the Material
and SheatheType fields in ItemDisplayInfo.dbc. Defines the
material categorization that items reference (Cloth / Leather /
Mail / Plate / Wood / Steel / Crystal / Ethereal / etc), each
with its own foley sound (played on item use), impact sound
(played on drop / hit), weight category, and material-property
flags (IsBreakable / IsMagical / IsFlammable / IsConductive /
IsHolyCharged / IsCursed).

The engine plays a sword's metallic clang from impactSoundId
when it hits a stone wall, but a cloth tabard makes no such
sound — the difference is exactly the material assigned by this
catalog. Every armor and weapon item in WIT references a
materialId here.

Twelve materialKind values cover the standard armor classes
(Cloth/Leather/Mail/Plate/Hide), structural materials (Wood /
Stone / Metal), and special categories (Liquid / Organic /
Crystal / Ethereal). Three weight tiers (Light / Medium / Heavy)
control encumbrance UI hints.

Cross-references back to WSND (foleySoundId / impactSoundId
reference WSND sound entries) and forward to WIT (item entries
reference materialId here).

Three preset emitters: --gen-mat (5 armor materials matching
WoW's armor classes), --gen-mat-weapon (5 weapon materials from
breakable+flammable Wood through enchanted endgame steel),
--gen-mat-magical (4 magical materials with special flags
including the IsHolyCharged anti-undead property).

Validation enforces id+name presence, materialKind 0..11,
weightCategory 0..2, no duplicate ids; warns on:
  - IsHolyCharged + IsCursed both set (engine picks one,
    typically IsCursed wins)
  - Plate kind that's not Heavy weight (canonical violation)
  - Cloth kind that's not Light weight (canonical violation)

Wired through the cross-format table; WMAT appears automatically
in all 11 cross-format utilities. Format count 75 -> 76; CLI flag
count 943 -> 948.

tools/editor/cli_list_formats.cpp

@@ -100,6 +100,7 @@ constexpr FormatRow kFormats[] = {
     {"WSPC", ".wspc",  "spells",    "Spell.dbc power-cost fields",      "Spell power cost bucket catalog"},
     {"WGFS", ".wgfs",  "glyphs",    "GlyphSlot.dbc",                    "Glyph slot layout catalog"},
     {"WCDF", ".wcdf",  "creatures", "CreatureDifficulty.dbc",           "Creature difficulty variant catalog"},
+    {"WMAT", ".wmat",  "items",     "Material.dbc + ItemDisplayInfo",   "Item material catalog"},
 
     // Additional pipeline catalogs without the alternating
     // gen/info/validate CLI surface (loaded by the engine