Creates a server-only console command, or hooks an already existing one.
Server commands are case sensitive.
void RegServerCmd(const char cmd, SrvCmd callback, const char description, int flags)
Name of the command to hook or create.
A function to use as a callback for when the command is invoked.
Optional description to use for command creation.
Optional flags to use for command creation.
Command name is the same as an existing convar.