Fixed bugs that were preventing NVR and Flash files from behind saved;

A lot of clean ups from waltje;
Start of a directory structure for the code, thanks to waltje.

src/keyboard_amstrad.c

@@ -7,13 +7,13 @@
 #include "mem.h"
 #include "pic.h"
 #include "pit.h"
-#include "sound.h"
-#include "sound_speaker.h"
 #include "timer.h"
-
+#include "sound/sound.h"
+#include "sound/snd_speaker.h"
 #include "keyboard.h"
 #include "keyboard_amstrad.h"
 
+
 #define STAT_PARITY     0x80
 #define STAT_RTIMEOUT   0x40
 #define STAT_TTIMEOUT   0x20