Client refactoring
new debug settings section on client UI
1. Converted python client to Python 3 (from 2x)

   This mostly required changes to the network package to do with string/byte conversion from
   hashing, b64 encoding, and send/recieving.

2. Started a new test.py source file which (without a curses interface) tries to log into the
   server and performs some common tasks. Written originally to track down python3 conversion
   issues, but will be useful in the future.
Started chunk rendering functionality on the client.