#67 Functions for unpacking based on byte arrays

[Uight]

This adds some new functions for packing/unpacking can messages based on byte arrays and does also support message lengths != 64 bit.

For me this is considered a base implementation that could be used to build on. (E.g. Message encode/decode function)

I also added a new benchmark project to the solution using dotnetbenchmark. This is optional but could help to tune performance in the future.