Add world handling (and fall to ground)

- World is now properly parsed and stored from chunk data
- Block changes are also handled and world updated accordingly
- Added ground checking, the player will move down to reach the ground
- Performance tweaking in Protocol18, using lists instead of arrays
- Fix player look not properly skipped causing invalid location after
teleport

MinecraftClient/Mapping/Block.cs

@@ -0,0 +1,99 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace MinecraftClient.Mapping
+{
+    /// <summary>
+    /// Represents a Minecraft Block
+    /// </summary>
+    public struct Block
+    {
+        /// <summary>
+        /// Storage for block ID and metadata
+        /// </summary>
+        private ushort blockIdAndMeta;
+
+        /// <summary>
+        /// Id of the block
+        /// </summary>
+        public short BlockId
+        {
+            get
+            {
+                return (short)(blockIdAndMeta >> 4);
+            }
+            set
+            {
+                blockIdAndMeta = (ushort)(value << 4 | BlockMeta);
+            }
+        }
+
+        /// <summary>
+        /// Metadata of the block
+        /// </summary>
+        public byte BlockMeta
+        {
+            get
+            {
+                return (byte)(blockIdAndMeta & 0x0F);
+            }
+            set
+            {
+                blockIdAndMeta = (ushort)((blockIdAndMeta & ~0x0F) | (value & 0x0F));
+            }
+        }
+
+        /// <summary>
+        /// Check if the block can be passed through or not
+        /// </summary>
+        public bool Solid
+        {
+            get
+            {
+                return BlockId != 0;
+            }
+        }
+
+        /// <summary>
+        /// Get a block of the specified type and metadata
+        /// </summary>
+        /// <param name="type">Block type</param>
+        /// <param name="metadata">Block metadata</param>
+        public Block(short type, byte metadata = 0)
+        {
+            this.blockIdAndMeta = 0;
+            this.BlockId = type;
+            this.BlockMeta = metadata;
+        }
+
+        /// <summary>
+        /// Get a block of the specified type and metadata
+        /// </summary>
+        /// <param name="typeAndMeta"></param>
+        public Block(ushort typeAndMeta)
+        {
+            this.blockIdAndMeta = typeAndMeta;
+        }
+
+        /// <summary>
+        /// Represents an empty block
+        /// </summary>
+        public static Block Air
+        {
+            get
+            {
+                return new Block(0);
+            }
+        }
+
+        /// <summary>
+        /// String representation of the block
+        /// </summary>
+        public override string ToString()
+        {
+            return BlockId.ToString() + (BlockMeta != 0 ? ":" + BlockMeta.ToString() : "");
+        }
+    }
+}