Thread updates

[ShelbyZ]

This is a collection of updates to move away from Win32 thread calls and provide more handling around errors found in other threads not causing Xiloader to exit.

• CreateThread -> std::thread
• Collapsed some thread spawning (FFXI Server -> FFXIDataComm, PolServer -> spawn PolDataComm)
• Exit FFXI thread last
• Update generic sleep calls - we may be able to turn these sleep calls into yield
• Provide signaling via shared state (mutex, condition_variable)
• Move FFXI into separate launch thread from main(...)
• main(...) waits for threads triggering a shutdown
• Socket cleanup logic
• Move global variables to local/passed to functions

Tested against local topaz servers and a few remote (Canaria, etc).

Below is a sample exit:

Accept Failed is triggered when xiloader closes up communication sockets during shutdown. If we do not close the sockets xiloader will hang on looking for connections or receiving data.