made separate class for xor, changed base64 encoder and decoder in conversion class to MIME, started crypto challenge working class
renamed XorUI to XorCalculatorUI, made repeatingKeyXorUI, corrected error in MonoSubKeywordUI
added ECB mode to AES encrypt/decrypt
added to challenge, corrected bug in xor cipher
made repeatingKeyXorUI take all ASCII character inputs for a key
many small changes, added logging to all catch blocks