DefaultEventManager registers a keymapper that is supposed to be
auto-freed. However, the event recorder then sets itself as a new
keymapper, but because the autofree flag is already set,
registerMapper() ends up deleting the event recorder itself. Setting
the autofree flag before actually freeing the mapper fixes the issue
and prevents ScummVM from crashing on startup
It was badly broken after refactoring into EventObserver.
Fitst, deinit() method was never called which lead to bad record
files. Then, the concept of counting pollEvent() calls was ignored.
Introduced dispatchPoll() method of EventObserver which is implemented
in EventRecorder. It counts calls so is able to inject events at
more proper time.
Additionally now event times are recorded.
