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

src/main.zig

@@ -953,13 +953,16 @@ const modules = [_]ModuleHooks{
     if (build_opts.transmogfix) .{ .install = transmogfix.installHooks, .remove = transmogfix.removeHooks } else .{},
     if (build_opts.minimapicons) .{ .install = minimapicons.installHooks, .remove = minimapicons.removeHooks } else .{},
     if (build_opts.healtextfix) .{ .install = healtextfix.installHooks, .remove = healtextfix.removeHooks } else .{},
-    if (build_opts.markers) .{ .install = markers.installHooks, .remove = markers.removeHooks, .remove_on_shutdown = true } else .{},
+    if (build_opts.markers) .{ .install = markers.installHooks, .remove = markers.removeHooks } else .{},
     if (build_opts.interact) .{ .install = interact.installHooks, .remove = interact.removeHooks } else .{},
     if (build_opts.outline) .{ .remove = outline.cleanup } else .{},
     if (build_opts.screenshot) .{ .remove = screenshot.removeHook } else .{},
 };
 
 fn shutdownDetour() callconv(sc) void {
+    // Clear marker definitions on logout/exit (not on map change).
+    if (build_opts.markers) markers.onShutdown();
+
     // Clean up world objects BEFORE game shutdown — atexit handlers run before
     // DllMain so modules with remove_on_shutdown must destroy here.
     comptime var i = modules.len;