fix a lot of issues on psogc; add proxy module

- $ann implemented
- concurrency removed; server is now single-threaded, event-driven and much more stable
- rare seed is no longer the game id; ids are sequential from server startup so they weren't random at all before
- supports dropping privileges; now you can run it as root so it can open a sockets on low ports, then it will switch to the given user before serving any traffic
- newserv now behaves like a proxy if you run it with the --proxy-destination=<IP_OR_HOSTNAME> argument; there's also an (invisible) shell in this mode where you can inject commands to the server or client. e.g. it can always be christmas in the lobby if you do `sc DA 01 00 00`
- increased the mtu on PSODolphinConfig's tap0 configuration; this seems to make the connection more stable
- fixed some uninitialized memory bugs
- the shell is now event-driven and now uses libevent too; unfortunately this means readline doesn't work anymore (no history and vim-like shortcuts)
- made network command display consistent for input vs. output (the header appears in both cases now)
- fixed bugs in some subcommand handling (the BB logic was being applied to non-BB clients erroneously, causing most item drops not to work at all)
- fixed player tags in the short lobby data struct. unclear if this was actually a problem but it was inconsistent with other servers
- fixed "unused" field in game join command (actually it appears to be disable_udp and should be 1, not 0)
- cleaned up Server abstraction a bit
- rewrote some text functions; asan was complaining about the built-in ones for some reason
- added an optional welcome message

PSODolphinConfig.py

@@ -54,7 +54,6 @@ def main(argv):
 
   try:
     username = os.environ['SUDO_USER']
-    print(username)
   except KeyError:
     print('$SUDO_USER not set; use `sudo -E`')
     return 1
@@ -72,6 +71,7 @@ def main(argv):
   os.set_inheritable(tap_fd, True)
   subprocess.check_call(['ifconfig', tap_name, args.tap_ip], stderr=subprocess.DEVNULL)
   subprocess.check_call(['ifconfig', tap_name, 'up'], stderr=subprocess.DEVNULL)
+  subprocess.check_call(['ifconfig', tap_name, 'mtu', '9000'], stderr=subprocess.DEVNULL)
 
   # 2. fork a Dolphin process, dropping privileges first
   print("starting dolphin")