Converted to use byte arrays directly

[fedjabosnic]

• Session
  • Removed string builder message buffer
  • Added byte array message buffer
• Message
  • The underlying raw message is now stored as a private byte array buffer
  • Refactored to parse a message from a byte array
  • can no longer parse messages from strings
• Field
  • The underlying raw message is now stored as a reference to a byte array buffer
• Extensions
  • Refactored to work on byte arrays rather than strings
• Testing
  • All unit tests refactored where required
• Benchmarks
  • Re-ran all benchmarks in full run mode

Notes:

• Unit tests now have to do string to byte array conversion so are a bit uglier
• Benchmarks for standard .net type parsing now have an extra step of converting the byte array to string since there is no natural byte array to type conversion in .net - hence they now cause allocation and garbage collection