implement attemptautoplay mechanic

iff MC::autoPlayTitles is enabled we catch EndedStates and try to
increment the title index by one. happens until we get from such an attempt
into playing|paused = success OR error = failure OR new source (which
aborts it all via resetMembers).

funny enough the title count supplied by the MC is always 0 because we
actually do not know. good stuff.

getting sick of these workarounds, slightly...