Returns information about an Event that was requested to be pinned into cache via
AK::SoundEngine::PinEventInStreamCache(). Retrieves the smallest buffer fill-percentage for each file referenced by the event, and whether the cache-pinned memory limit is preventing any of the files from filling up their buffer.
||Unique ID of the event
||Fill-percentage (out of 100) of requested buffer size for least buffered file in the event.
||True if at least one file can not complete buffering because the cache-pinned memory limit would be exceeded.