Added unban/unbanip

Fixed banning when a player picks up lava/water
Fixed name check for real this time.
Fixed banning multiple times.

TShockAPI/BanManager.cs

@@ -47,10 +47,17 @@ namespace TShockAPI
 
         public void AddBan(string ip, string name = "", string reason = "")
         {
+            if (GetBanByIp(ip) != null)
+                return;
             Bans.Add(new Ban(ip, name, reason));
             SaveBans();
         }
 
+        public void RemoveBan(Ban ban)
+        {
+            Bans.Remove(ban);
+        }
+
         /// <summary>
         /// Reloads the file if it was changed
         /// </summary>