Move most detectables to new interface

BinaryObjectScanner.FileType/PLJ.cs

@@ -0,0 +1,44 @@
+using System;
+using System.IO;
+using BinaryObjectScanner.Interfaces;
+using BinaryObjectScanner.Matching;
+
+namespace BinaryObjectScanner.FileType
+{
+    /// <summary>
+    /// PlayJ audio file
+    /// </summary>
+    public class PLJ : IDetectable
+    {
+        /// <inheritdoc/>
+        public string Detect(string file, bool includeDebug)
+        {
+            if (!File.Exists(file))
+                return null;
+
+            using (var fs = File.Open(file, FileMode.Open, FileAccess.Read, FileShare.Read))
+            {
+                return Detect(fs, file, includeDebug);
+            }
+        }
+
+        /// <inheritdoc/>
+        public string Detect(Stream stream, string file, bool includeDebug)
+        {
+            try
+            {
+                byte[] magic = new byte[16];
+                stream.Read(magic, 0, 16);
+
+                if (magic.StartsWith(new byte?[] { 0xFF, 0x9D, 0x53, 0x4B }))
+                    return "PlayJ Audio File";
+            }
+            catch (Exception ex)
+            {
+                if (includeDebug) Console.WriteLine(ex);
+            }
+
+            return null;
+        }
+    }
+}