* After determining the script to use, starting it is done as follows
 *
 * - An instance is constructed of the class derived from ScriptController
 *   (Class name is retrieved from ScriptInfo::CreateInstance)..
 * - If there is script data available in the loaded game and if the data is
 *   loadable according to ScriptInfo::MinVersionToLoad, #Load is called with the
 *   data from the loaded game.
 * - Finally, #Start is called to start execution of the script.
 *
 * See also http://wiki.openttd.org/AI:Save/Load for more details.
 *