Add support for Mac Roman character encoding

[jhalter]

Add support for Mac Roman character encoding.

Incoming strings from the client will be assumed to be Mac Roman encoding instead of ASCII and converted to UTF-8.

Outgoing strings will be converted from UTF-8 to Mac Roman.

Mac Client:

Server file system:

❯ ls
HéLLø                   My Cool Stuff ƒ

[jhalter]

Fixes #37