The start/intro dialog, the inventory dialog and the conversation
dialog now call delayMillis() in their event loop. This is
consistent with how the action menu dialog already worked.
This was intended to be used to simultaneously support the cheat mode dialog with all the inventory items. But that is going to need to be implemented as a completely separate dialog.
This makes the code use Common::List for all cases where synchronization can
not be done with tSage::List::synchronise. Furthermore I renamed the custom
List class to SynchronisedList to stress its purpose.
I also removed clear2, contains and forEach and replaced them with algorithm
usage from Common:: or in the case of "contains" replaced them with a simple
inline function which uses Common::find.
