This function allows you to set the state of processing certain event types.
If state is set to SDL_IGNORE, that event type will be automatically dropped from the event queue and will not be filtered.
If state is set to SDL_ENABLE, that event type will be processed normally.
If state is set to SDL_QUERY, SDL_EventState will return the current processing state of the specified event type.
A list of event types can be found in the SDL_Event section.