Reretarget (SuperWoW + GUID Integration - Hunter Only) IMPROVEMENT: UNIT_CASTEVENT-based Feign Death detection

• ONLY tracks Hunters (Rogues removed - retarget makes no sense for Vanish)
• Instant detection: Cast event = Feign Death, No cast = Real death
• NO MORE TIMERS - instant reaction!
• FIXED: Race condition when Hunter re-casts FD immediately after standing up
• FIXED: Target check for FD when selecting dead Hunter
• FIXED: Memory leak in lastDeathWasFD table