Migrate recent HLLib work to BOS

It's better suited for the model of BOS and not an update to HLLibSharp

BurnOutSharp.Models/VBSP/File.cs

@@ -0,0 +1,14 @@
+namespace BurnOutSharp.Models.VBSP
+{
+    /// <summary>
+    /// Half-Life 2 Level
+    /// </summary>
+    /// <see href="https://github.com/RavuAlHemio/hllib/blob/master/HLLib/VBSPFile.h"/>
+    public sealed class File
+    {
+        /// <summary>
+        /// Directory header data
+        /// </summary>
+        public Header Header { get; set; }
+    }
+}

BurnOutSharp.Models/VBSP/Header.cs

@@ -0,0 +1,31 @@
+namespace BurnOutSharp.Models.VBSP
+{
+    /// <see href="https://github.com/RavuAlHemio/hllib/blob/master/HLLib/VBSPFile.h"/>
+    public sealed class Header
+    {
+        /// <summary>
+        /// BSP file signature.
+        /// </summary>
+        public string Signature;
+
+        /// <summary>
+        /// BSP file version.
+        /// </summary>
+        /// <remarks>
+        /// 19-20:			Source
+        /// 21:				Source - The lump version property was moved to the start of the struct.
+        /// 0x00040014:		Dark Messiah - Looks like the 32 bit version has been split into two 16 bit fields.
+        /// </remarks>
+        public int Version;
+
+        /// <summary>
+        /// Lumps.
+        /// </summary>
+        public Lump[] Lumps;
+
+        /// <summary>
+        /// The map's revision (iteration, version) number.
+        /// </summary>
+        public int MapRevision;
+    }
+}

BurnOutSharp.Models/VBSP/Lump.cs

@@ -0,0 +1,20 @@
+namespace BurnOutSharp.Models.VBSP
+{
+    /// <see href="https://github.com/RavuAlHemio/hllib/blob/master/HLLib/VBSPFile.h"/>
+    public sealed class Lump
+    {
+        public uint Offset;
+
+        public uint Length;
+
+        /// <summary>
+        /// Default to zero.
+        /// </summary>
+        public uint Version;
+
+        /// <summary>
+        /// Default to (char)0, (char)0, (char)0, (char)0.
+        /// </summary>
+        public char[] FourCC;
+    }
+}

BurnOutSharp.Models/VBSP/LumpHeader.cs

@@ -0,0 +1,16 @@
+namespace BurnOutSharp.Models.VBSP
+{
+    /// <see href="https://github.com/RavuAlHemio/hllib/blob/master/HLLib/VBSPFile.h"/>
+    public sealed class LumpHeader
+    {
+        public int LumpOffset;
+
+        public int LumpID;
+
+        public int LumpVersion;
+
+        public int LumpLength;
+
+        public int MapRevision;
+    }
+}