directory re-organization (keeps the old build system)

there is no internal modification of any file in this commit

files are moved into directories according to established standards in
sourcecode distribution; these directories contain:

 src - Files that are used in constructing the executable binaries,
       but are not installed.

 doc - Files in HTML and text format that document usage, quirks of
       the implementation, and contributor checklists.

 locale - Files that contain human language translation of strings
          used in the program

 contrib - Files contributed from distributions or other third party
 	   implementing scripts and auxiliary programs

src/cryptopp/pch.h

@@ -0,0 +1,21 @@
+#ifndef CRYPTOPP_PCH_H
+#define CRYPTOPP_PCH_H
+
+#ifdef CRYPTOPP_GENERATE_X64_MASM
+
+	#include "cpu.h"
+
+#else
+
+	#include "config.h"
+
+	#ifdef USE_PRECOMPILED_HEADERS
+		#include "simple.h"
+		#include "secblock.h"
+		#include "misc.h"
+		#include "smartptr.h"
+	#endif
+
+#endif
+
+#endif