Update log file with expected naming.
Fix load_config and don't change directory back to start.

Welcome message and config dir were not being initialized correctly
and were causing chdir to be unsuccessful. Removed chdir back to the
start directory because it's easier for the server to handle logging
and loading anything else it needs during its lifetime.
Implement error logging for MySQL.
Include character port in server_config structure.
Finish basic implementation of LOGIN portion of the server.

There's very likely still functionality that needs to be added
(mainly init) but everything builds and the client makes it to
the CHARACTER portion, which is where the next development effort
is heading.