Fixed some bugs and warnings.

Moved the SIO files to a new sio/ folder.
Added the 'version.h'stuff, added Makefile rule to generate the Manifest file for Windows.
Re-worked the About dialog - it now includes more info.

src/win/win_settings.c

@@ -8,7 +8,7 @@
  *
  *		Implementation of the Settings dialog.
  *
- * Version:	@(#)win_settings.c	1.0.5	2018/03/01
+ * Version:	@(#)win_settings.c	1.0.6	2018/03/07
  *
  * Authors:	Fred N. van Kempen, <decwiz@yahoo.com>
  *		Miran Grca, <mgrca8@gmail.com>
@@ -35,12 +35,13 @@
  *   USA.
  */
 #define UNICODE
+#define WIN32_LEAN_AND_MEAN
 #include <windows.h>
-#include <windowsx.h>
 #include <commctrl.h>
 #include <inttypes.h>
 #include <stdio.h>
 #include <stdint.h>
+#include <stdlib.h>
 #include <string.h>
 #include <wchar.h>
 #include "../emu.h"