This fixes some errors caused by Windows defining things like min and max, as well as a number of warnings about type conversion, unused parameters, inability to generate assignment operators, and constant conditions.
All type conversions were assumed to be intentional, and static_casts have been added to remove the compiler warnings.
The server code should now build cleanly with level 4 warnings enabled (as used in my project), and the client code should build cleanly with level 3 warnings enabled (as used by the WebSocket++ projects).
