Add support for Minecraft Settings

- Add Minecraft vanilla settings from Settings screen
 - These settings are sent to server when joining
 - Allows to customize skin layers shown to other players
 - Most other settings are ignored by servers
 - Update language file from 1.9 to 1.10 version
 - Minor aesthetic changes in INI file comments

Suggestion by TNT-UP in issue #161 and Splodger1 in MC Forum.

MinecraftClient/Protocol/Handlers/Protocol16.cs

@@ -626,6 +626,11 @@ namespace MinecraftClient.Protocol.Handlers
             return false; //Only supported since MC 1.7
         }
 
+        public bool SendClientSettings(string language, byte viewDistance, byte difficulty, byte chatMode, bool chatColors, byte skinParts, byte mainHand)
+        {
+            return false; //Currently not implemented
+        }
+
         public bool SendLocationUpdate(Location location, bool onGround)
         {
             return false; //Currently not implemented

MinecraftClient/Protocol/Handlers/Protocol18.cs

@@ -1469,6 +1469,42 @@ namespace MinecraftClient.Protocol.Handlers
             return SendPluginChannelPacket("MC|Brand", getString(brandInfo));
         }
 
+        /// <summary>
+        /// Inform the server of the client's Minecraft settings
+        /// </summary>
+        /// <param name="language">Client language eg en_US</param>
+        /// <param name="viewDistance">View distance, in chunks</param>
+        /// <param name="difficulty">Game difficulty (client-side...)</param>
+        /// <param name="chatMode">Chat mode (allows muting yourself)</param>
+        /// <param name="chatColors">Show chat colors</param>
+        /// <param name="skinParts">Show skin layers</param>
+        /// <param name="mainHand">1.9+ main hand</param>
+        /// <returns>True if client settings were successfully sent</returns>
+        public bool SendClientSettings(string language, byte viewDistance, byte difficulty, byte chatMode, bool chatColors, byte skinParts, byte mainHand)
+        {
+            try
+            {
+                List<byte> fields = new List<byte>();
+                fields.AddRange(getString(language));
+                fields.Add(viewDistance);
+                fields.AddRange(protocolversion >= MC19Version
+                    ? getVarInt(chatMode)
+                    : new byte[] { chatMode });
+                fields.Add(chatColors ? (byte)1 : (byte)0);
+                if (protocolversion < MC18Version)
+                {
+                    fields.Add(difficulty);
+                    fields.Add((byte)(skinParts & 0x1)); //show cape
+                }
+                else fields.Add(skinParts);
+                if (protocolversion >= MC19Version)
+                    fields.AddRange(getVarInt(mainHand));
+                SendPacket(protocolversion >= MC19Version ? 0x04 : 0x15, fields);
+            }
+            catch (SocketException) { }
+            return false;
+        }
+
         /// <summary>
         /// Send a location update to the server
         /// </summary>

MinecraftClient/Protocol/IMinecraftCom.cs

@@ -20,14 +20,12 @@ namespace MinecraftClient.Protocol
         /// Start the login procedure once connected to the server
         /// </summary>
         /// <returns>True if login was successful</returns>
-
         bool Login();
 
         /// <summary>
         /// Disconnect from the server
         /// </summary>
         /// <param name="message">Reason</param>
-
         void Disconnect();
 
         /// <summary>
@@ -35,14 +33,12 @@ namespace MinecraftClient.Protocol
         /// </summary>
         /// <param name="message">Text to send</param>
         /// <returns>True if successfully sent</returns>
-
         bool SendChatMessage(string message);
 
         /// <summary>
         /// Allow to respawn after death
         /// </summary>
         /// <returns>True if packet successfully sent</returns>
-
         bool SendRespawnPacket();
 
         /// <summary>
@@ -50,15 +46,26 @@ namespace MinecraftClient.Protocol
         /// </summary>
         /// <param name="brandInfo">Client string describing the client</param>
         /// <returns>True if brand info was successfully sent</returns>
-
         bool SendBrandInfo(string brandInfo);
 
+        /// <summary>
+        /// Inform the server of the client's Minecraft settings
+        /// </summary>
+        /// <param name="language">Client language eg en_US</param>
+        /// <param name="viewDistance">View distance, in chunks</param>
+        /// <param name="difficulty">Game difficulty (client-side...)</param>
+        /// <param name="chatMode">Chat mode (allows muting yourself)</param>
+        /// <param name="chatColors">Show chat colors</param>
+        /// <param name="skinParts">Show skin layers</param>
+        /// <param name="mainHand">1.9+ main hand</param>
+        /// <returns>True if client settings were successfully sent</returns>
+        bool SendClientSettings(string language, byte viewDistance, byte difficulty, byte chatMode, bool chatColors, byte skinParts, byte mainHand);
+
         /// <summary>
         /// Send a location update telling that we moved to that location
         /// </summary>
         /// <param name="location">The new location</param>
         /// <returns>True if packet was successfully sent</returns>
-
         bool SendLocationUpdate(Location location, bool onGround);
 
         /// <summary>
@@ -68,7 +75,6 @@ namespace MinecraftClient.Protocol
         /// <param name="channel">Channel to send packet on</param>
         /// <param name="data">packet Data</param>
         /// <returns>True if message was successfully sent</returns>
-
         bool SendPluginChannelPacket(string channel, byte[] data);
     }
 }