dpslog: handler table swaps, CombatLogGetCurrentEventInfo, unit flags, boolean fix

Major architectural changes:

- Migrate 12 packet handlers from JMP-patching Detours to NetClient opcode
  handler table pointer swaps. No code bytes modified — only heap pointers.
  Invisible to Warden memory scans. Hook InitializeGameEngine (0x401570,
  __thiscall) to install swaps after all handlers are registered.

- Implement CombatLogGetCurrentEventInfo() — WotLK-style lazy arg retrieval.
  Event fires with no args; addons call the function to get all fields from
  a C-side buffer. No arg count limit (bypasses ExecuteLuaCallback 19-arg cap).
  Includes unit flags, raid flags, and all suffix fields.

- Compute COMBATLOG_OBJECT_* unit flags: affiliation (MINE/PARTY/RAID/OUTSIDER),
  reaction (FRIENDLY/NEUTRAL/HOSTILE via UnitReaction), control (PLAYER/NPC),
  type (PLAYER/NPC/PET/GUARDIAN/OBJECT via SUMMONEDBY check), special (TARGET),
  and raid target markers.

- Fix boolean fields (critical/glancing/crushing): changed from %d (Lua number 0,
  which is TRUTHY) to nil/"1" via boolToLua(). Details addon was counting every
  hit as critical because it uses truthiness checks.

- SPELL_INSTAKILL now fires from SPELLLOGEXECUTE (has caster GUID).
  Standalone SMSG_SPELLINSTAKILLLOG handler is pass-through only.

- SPELL_EXTRA_ATTACKS now uses target GUID from packet (was discarded).

- SPELL_CAST_START/SUCCESS now parse spell target from packet.

- SPELL_DRAIN subevent added for instant power drain effects.

- Rename event from COMBAT_LOG_EVENT to COMBAT_LOG_EVENT_UNFILTERED.

- Update DPSMate and WSBT CLEU adapters to use CombatLogGetCurrentEventInfo().

- Remove unnecessary `or 0` guards on numeric fields (always non-nil from C).

src/dpslog/RESEARCH.md

@@ -592,6 +592,14 @@ All in the 0x51xxxx addon/UI system. Zeroing/overwriting these corrupts game sta
 - Known limitations: false positives if damage + unrelated aura removal happen in same batch;
   no coverage for SPELL_AURA_BROKEN (without spell — melee break) since we pass spellId=0 for melee
 
+### Future — Custom Extensions (beyond WotLK spec)
+- [ ] **RESURRECT_ACCEPTED**: Current SPELL_RESURRECT fires on cast/effect (ProcessSpellEffect),
+  not when the target accepts. Detect via outgoing CMSG_RESURRECT_RESPONSE (0x15C) or
+  SMSG_UPDATE_OBJECT alive state change. Related: SMSG_RESURRECT_REQUEST (0x15B),
+  SMSG_RESURRECT_FAILED (0x252).
+- [ ] **UNIT_POSITION**: Periodic or event-driven unit position data in combat log events.
+  Useful for replay/analysis tools.
+
 ### Completed reference
 - [x] RANGE_MISSED: Detected via spell ID check (75/5019) in ProcessSpellCombatResult hook.
 - [x] SPELL_SUMMON / SPELL_RESURRECT / SPELL_ENERGIZE: Hook ProcessSpellEffect (0x62ACE0),