Converts targeting packets (#330)

- [X] Converts targeting packets.

### BREAKING CHANGE TO TARGET CLASS

```cs
public virtual Packet GetPacketFor(NetState ns)
```

Changed to:
```cs
public virtual void SendPacketTo(NetState ns)
```

Bumps release version

Projects/Server/Network/Packets/OutgoingTargetPackets.cs

@@ -0,0 +1,87 @@
+/*************************************************************************
+ * ModernUO                                                              *
+ * Copyright 2019-2020 - ModernUO Development Team                       *
+ * Email: hi@modernuo.com                                                *
+ * File: OutgoingTargetPackets.cs                                        *
+ *                                                                       *
+ * This program is free software: you can redistribute it and/or modify  *
+ * it under the terms of the GNU General Public License as published by  *
+ * the Free Software Foundation, either version 3 of the License, or     *
+ * (at your option) any later version.                                   *
+ *                                                                       *
+ * You should have received a copy of the GNU General Public License     *
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>. *
+ *************************************************************************/
+
+using System;
+using System.Buffers;
+using Server.Targeting;
+
+namespace Server.Network
+{
+    public static class OutgoingTargetPackets
+    {
+        public static void SendMultiTargetReq(this NetState ns, MultiTarget t)
+        {
+            if (ns == null || !ns.GetSendBuffer(out var buffer))
+            {
+                return;
+            }
+
+            var writer = new CircularBufferWriter(buffer);
+            writer.Write((byte)0x99); // Packet ID
+            writer.Write(t.AllowGround);
+            writer.Write(t.TargetID);
+            writer.Write((byte)t.Flags);
+            writer.Clear(11);
+            writer.Write((short)t.MultiID);
+            writer.Write((short)t.Offset.X);
+            writer.Write((short)t.Offset.Y);
+            writer.Write((short)t.Offset.Z);
+            if (ns.HighSeas)
+            {
+                writer.Write(0);
+            }
+
+            ns.Send(ref buffer, writer.Position);
+        }
+
+        public static void SendCancelTarget(this NetState ns)
+        {
+            if (ns == null)
+            {
+                return;
+            }
+
+            Span<byte> span = stackalloc byte[]
+            {
+                0x6C, // Packet ID
+                0, // Allow Ground?
+                0, 0, 0, 0, // Target ID
+                3, // Flags
+                0, 0, 0, 0, 0,
+                0, 0, 0, 0, 0,
+                0, 0
+            };
+
+            ns.Send(span);
+        }
+
+        public static void SendTargetReq(this NetState ns, Target t)
+        {
+            if (ns == null || !ns.GetSendBuffer(out var buffer))
+            {
+                return;
+            }
+
+            var writer = new CircularBufferWriter(buffer);
+            writer.Write((byte)0x6C); // Packet ID
+            writer.Write(t.AllowGround);
+            writer.Write(t.TargetID);
+            writer.Write((byte)t.Flags);
+            writer.Clear(12);
+
+            ns.Send(ref buffer, writer.Position);
+        }
+    }
+}