Allow lobby players to warp in-region.

Historically, we've seen plugins try to "auto-correct" the falling-through-the-world bug in Minecraft when chunks load too slowly. The plugins often solve this by force-warping until the player is stable, and blocking those teleport events are going to cause heavy "not allowed" spam.

src/main/java/com/garbagemule/MobArena/ArenaListener.java

@@ -1205,7 +1205,7 @@ public class ArenaListener
         if (region.contains(from)) {
             if (region.contains(to)) {
                 // Inside -> inside
-                if (!arena.inArena(p)) {
+                if (!(arena.inArena(p) || arena.inLobby(p))) {
                     arena.getMessenger().tell(p, Msg.WARP_TO_ARENA);
                     return TeleportResponse.REJECT;
                 }