Removed the file pointer from the hdd_t struct;

Partially split off the Logitech Serial Mouse emulation from Microsoft Serial Mouse;
Slightly reworked serial port emulation (the two UART's are now device_t's, non-FIFO mode implemented and is now default, FIFO mode reimplemented from scratch so it's now actually correct);
Added the emulation of the SiS 85c497 chip to the SiS 85c496/497 chipset;
Bugfixes to the emulated Super I/O chips and made them all device_t's now.

src/disk/hdd.h

@@ -85,7 +85,6 @@ typedef struct {
     uint8_t	wp;			/* Disk has been mounted READ-ONLY */
     uint8_t	pad, pad0;
 
-    FILE	*f;			/* Current file handle to image */
     void	*priv;
 
     wchar_t	fn[1024],		/* Name of current image file */