Do not clear the plugin/event handler map on WorldEventManager destruction, because we don't own it and it might have already been freed before our destructor was called. Fixes a segfault on exit on Mac OS X when plugins are loaded.
Do not clear the plugin/event handler map on WorldEventManager destruction, because we don't own it and it might have already been freed before our destructor was called.
Fixes a segfault on exit on Mac OS X when plugins are loaded.

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