StartClient(): Make a local copy of server_name.
StartClient(): Make a local copy of server_name.

Previously we just held onto the const char* provided by the user.
This does not work in cases such as Java which provide a temporary
string.

robotdotnet/ntcore,333fred/ntcore,wpilibsuite/ntcore,wpilibsuite/ntcore,333fred/ntcore,333fred/ntcore,robotdotnet/ntcore,333fred/ntcore,robotdotnet/ntcore,robotdotnet/ntcore,wpilibsuite/ntcore,wpilibsuite/ntcore