Spectator-Teleport Implementation (#1825)

MinecraftClient/McClient.cs

@@ -1695,6 +1695,41 @@ namespace MinecraftClient
         {
             return InvokeOnMainThread(() => handler.UpdateCommandBlock(location, command, mode, flags));
         }
+
+        /// <summary>
+        /// Teleport to player in spectator mode
+        /// </summary>
+        /// <param name="entity">Player to teleport to</param>
+        /// Teleporting to other entityies is NOT implemented yet
+        public bool Spectate(Entity entity)
+        {
+            if(entity.Type == EntityType.Player)
+            {
+                return SpectateByUUID(entity.UUID);
+            }
+            else
+            {
+                return false;
+            }
+        }
+
+        /// <summary>
+        /// Teleport to player/entity in spectator mode
+        /// </summary>
+        /// <param name="UUID">UUID of player/entity to teleport to</param>
+        public bool SpectateByUUID(Guid UUID)
+        {
+            if(GetGamemode() == 3)
+            {
+                if(InvokeRequired)
+                    return InvokeOnMainThread(() => SpectateByUUID(UUID));
+                return handler.SendSpectate(UUID);
+            }
+            else
+            {
+                return false;
+            }
+        }
         #endregion
 
         #region Event handlers: An event occurs on the Server