* add a check to prevent multiple log handler additions. Still a hack, but ok for this purpose.
* GuessKey_Statistics.__init__() now validates is_solved using same class validator as unpack()
* fix exception text to reflect allowed types for Hangman_State
* Also in Hangman_State, fix validation when input is bytes / bytearray
* In dc34_PlayHangman_validate_user_input(), strip the input before checking length.
Henry Gabryjelski
075f353f98