feat(ui): implement Script_DisconnectFromServer

src/ui/ScriptFunctionsGlueScriptEvents.cpp

@@ -256,7 +256,14 @@ int32_t Script_GetServerName(lua_State* L) {
 }
 
 int32_t Script_DisconnectFromServer(lua_State* L) {
-    WHOA_UNIMPLEMENTED(0);
+    if (ClientServices::Connection()->IsConnected()) {
+        CGlueMgr::m_disconnectPending = 1;
+        ClientServices::Connection()->Disconnect();
+    }
+
+    ClientServices::LoginConnection()->Logoff();
+
+    return 0;
 }
 
 int32_t Script_IsConnectedToServer(lua_State* L) {