Save player data on backups

Server Side Inventory security improvements, blocking trashcan and "banks" items
CovertCorruption is now more thorough.
PvP Modes, normal, always, disabled now configurable
Initial group prefix/suffix implementation
Range checks reworked, Killing ice blocks now ignored for ice rod.
Adding a NPC name to item banlist will block it from spawning
Added configs to disable snowballs and clown bombs from npcs.

TShockAPI/Group.cs

@@ -28,6 +28,8 @@ namespace TShockAPI
         public string Name { get; set; }
         public Group Parent { get; set; }
         public int Order { get; set; }
+        public string Prefix { get; set; }
+        public string Suffix { get; set; }
 
         public byte R = 255;
         public byte G = 255;