u can use any ad-hoc value if you want to use this to track something that's not an actual mission.
        </li>
        <li><span class="parameter">endVal</span>
         Anything. A value you want to store in the finished missions table (eg to determine how the mission ended if it has multiple endings). (Optional)
        </li>
        <li><span class="parameter">skipFunc</span>
         Boolean. Whether to skip the fail() function (assuming the mission actually has one) (Optional)
        </li>
        