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

Text.cc

@@ -14,15 +14,36 @@ using namespace std;
 
 
 int char16cmp(const char16_t* s1, const char16_t* s2, size_t count) {
-  return char_traits<char16_t>::compare(s1, s2, count);
+  size_t x;
+  for (x = 0; x < count && s1[x] != 0 && s2[x] != 0; x++) {
+    if (s1[x] < s2[x]) {
+      return -1;
+    } else if (s1[x] > s2[x]) {
+      return 1;
+    }
+  }
+  if (s1[x] < s2[x]) {
+    return -1;
+  } else if (s1[x] > s2[x]) {
+    return 1;
+  }
+  return 0;
 }
 
-char16_t* char16cpy(char16_t* dest, const char16_t* src, size_t count) {
-  return char_traits<char16_t>::copy(dest, src, count);
+void char16cpy(char16_t* dest, const char16_t* src, size_t count) {
+  size_t x;
+  for (x = 0; x < count && src[x] != 0; x++) {
+    dest[x] = src[x];
+  }
+  if (x < count) {
+    dest[x] = 0;
+  }
 }
 
 size_t char16len(const char16_t* s) {
-  return char_traits<char16_t>::length(s);
+  size_t x;
+  for (x = 0; s[x] != 0; x++);
+  return x;
 }