added direction variable to swtich direction randomly
tweaked player speed and incoming hexagon speed
tested more songs - Chet Faker - Gold works well
added CRC16 function obtained from http://sanity-free.org/134/standard_crc_16_in_csharp.html
random is now seeded from checksum of first 10000 bytes of audio data from selected file. This ensures that each playthrough yeilds the same experience (theoretically) for an individual piece of music