fix keyHandler becoming unremovable if added to two different keys #653
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When merged this pull request will:
Has to remove the old handler if the hash is reused. Currently undefined behavior I guess, but this should be cleaner. Otherwise there could be multiple entries in
GVAR(keyDown/UpStates)
and all but the last one cannot be removed, because the index inGVAR(keyHandlersDown/Up)
is overwritten.