Added serializer precompile to preload step for kdbp files

src/KeePassLib2Android/Serialization/ProtoBuf/KdbpFile.cs

@@ -15,6 +15,14 @@ namespace KeePassLib.Serialization
 	{
 		public const string FileNameExtension = "kdbp";
 
+		/// <summary>
+		/// Precompiles the serializer classes for faster first-run execution
+		/// </summary>
+		public static void PrepareSerializer()
+		{
+			RuntimeTypeModel.Default[typeof(PwDatabaseBuffer)].CompileInPlace();
+		}
+
 		/// <summary>
 		/// Determines whether the database pointed to by the specified ioc should be (de)serialised in default (xml) or protocol buffers format.
 		/// </summary>