Updated to Python 3

[bschollnick]

1. Updated the BOA code to work with wxPython 4 (Phoenix)
2. Went through and updated all the String module code to work with Python 3 (eg string.lower(variable) -> variable.lower())
3. Other minor changes

But the code appears to be running, and successfully processing the two included games (cloak.py & thief.py).