- audio_engine.cpp: cache key was based on vector pointer address, not
content — cache never hit since each asset load produces a new
allocation. Replace with FNV-1a over head+tail bytes + size, giving
correct content-based identity at O(1) cost. Add 256-entry cap with
eviction to prevent unbounded growth over long sessions.
- game_handler.hpp/cpp, spellbook_screen, game_screen: knownSpells was
a std::vector with O(n) std::find lookups scattered across packet
handlers and UI code. Switch to std::unordered_set for O(1) insert,
erase, and membership checks. Update all push_back/erase-remove/find
call sites to use set operations.
WotLK 3.3.5a uses .wav files for NPC voices, not .ogg as shown in retail Wowhead. Fixed audio engine to preserve original sample rate from WAV files (preventing chipmunk playback). Implemented race/gender detection using CreatureDisplayInfo.dbc and CreatureDisplayInfoExtra.dbc to play correct voice types for each NPC.
