Add marker persistence, respawn, group sync, and fix pushnumber ABI

Marker definitions (position + area ID) now persist across zone
transitions. Entities are destroyed on map change but respawned
automatically when the player approaches within 200y. Definitions
are cleared on logout/exit via onShutdown hook.

Group sync via addon messages (WMark prefix, colon-delimited protocol)
with permission checks (raid leader/assist, party leader). Includes
sync request/response for late joiners and roster change broadcasting.

Fix lua_pushnumber calling convention: function is __thiscall (ECX=L,
f64 on stack, ret 8), not __fastcall. The patched inreg fastcall was
placing the f64's low dword in EDX, corrupting values.

Other fixes:
- Remove Bindings.xml from .toc files (explicit binding loader needed)
- Remove remove_on_shutdown for markers (was killing hooks on logout)
- Remove diagnostic entity check code (culling behavior understood)
- New Lua APIs: SetMarkerDef, ClearMarkerDef, GetMarkerDef
- Rename binding labels to marker colors

DLL_README.md

@@ -46,13 +46,15 @@ A keybinding is available in the Key Bindings menu.
 
 ### Interact
 
-Smart interaction for faster farming and dungeon runs:
+Smart interaction helpers for faster farming and dungeon runs:
 
 - **Interact Nearest** -- right-clicks the closest interactable NPC or object within 5 yards
+- **Loot All Corpses** -- bulk loots all nearby corpses in sequence
 
 Best used via keybindings (available in the Key Bindings menu) or macros:
 ```
 /run InteractNearest(1)
+/run LootAllCorpses()
 ```
 
 **DLL:** `interact.dll`