Major commit, cleaning a lot of old stuff.

IBM.H is gone, video stuff re-organized. Keyboard stuff reorganized.
Machines that have their own video, mouse and/or keyboard now have all this in their machine file.
Fixed and other cleanups here and there.

src/disk/hdc_mfm_xt.c

@@ -41,7 +41,7 @@
  *		Since all controllers (including the ones made by DTC) use
  *		(mostly) the same API, we keep them all in this module.
  *
- * Version:	@(#)hdd_mfm_xt.c	1.0.11	2017/10/26
+ * Version:	@(#)hdc_mfm_xt.c	1.0.12	2017/11/04
  *
  * Authors:	Sarah Walker, <http://pcem-emulator.co.uk/>
  *		Fred N. van Kempen, <decwiz@yahoo.com>
@@ -58,7 +58,6 @@
 #include <stdlib.h>
 #include <wchar.h>
 #include "../86box.h"
-#include "../ibm.h"
 #include "../device.h"
 #include "../dma.h"
 #include "../io.h"