CharSections.dbc has different field layouts between stock WotLK (textures
at field 4-6) and Classic/TBC/Turtle/HD-textured WotLK (VariationIndex at
field 4). Add detectCharSectionsFields() that probes field-4 values at
runtime to determine the correct layout, so both stock and modded clients
work without JSON changes.
Also add BLOODELF_MALE/FEMALE and DRAENEI_MALE/FEMALE voice types to the
NPC voice system — previously all Blood Elf and Draenei NPCs fell through
to GENERIC (random dwarf/gnome/night elf/orc mix).
Replace hardcoded WotLK protocol constants with a data-driven architecture
supporting Classic 1.12.1, TBC 2.4.3, and WotLK 3.3.5a. Each expansion
has JSON profiles for opcodes, update fields, and DBC layouts, plus C++
polymorphic packet parsers for binary format differences (movement flags,
speed fields, transport data, spline format, char enum layout).
Key components:
- ExpansionRegistry: scans Data/expansions/*/expansion.json at startup
- OpcodeTable: logical enum <-> wire values loaded from JSON
- UpdateFieldTable: field indices loaded from JSON per expansion
- DBCLayout: schema-driven DBC field lookups replacing magic numbers
- PacketParsers: WotLK/TBC/Classic parsers with correct flag positions
- Multi-manifest AssetManager: layered manifests with priority ordering
- HDPackManager: overlay texture packs with expansion compatibility
- Auth screen expansion picker replacing hardcoded version dropdown
