Rewritten 808x CPU emulation core based on reenigne's XTCE, VisiOn, SnatchIt, and 8088 MPH now work correctly;

Fixed PC speaker sound volume in PIT mode 0;
A few CPU emulation clean-ups;
Hard disk controller changing redone in a less messy way;
Re-added the long-missing key send delay handling to the XT keyboard handler;
Fixed a bug that was causing SLiRP not to work when compiled with MingW/GCC 7.3.0-2 or newer;
Some serial mouse and port fixes;
A lot of changes to printer emulation, mostly based on DOSBox-X;
Printer PNG writer now uses statically linked libpng;
Added support for the HxC MFM floppy image format and upped 86F format version to 2.12;
Ported various things from PCem and some from VARCem;
Added the S3 86c801/805 emulation (patch from TheCollector1995);
Fixed and renamed the EGA monitor options;
Better synchronized the 808x to the PIT and the CGA;
Fixed the CGA wait state calculation;
Cleaned up some things in mem.c;
Fixed some things in the floppy emulation to make VisiOn get the correct errors from the copy protection disk;
Fixed several renderer-related bugs, including the SDL2 renderer's failure to take screenshots;
The Jenkins builds are now compiled with MingW/GCC 7.4.0-1 and include all the required DLL's.

src/disk/hdc.c

@@ -8,7 +8,7 @@
  *
  *		Common code to handle all sorts of disk controllers.
  *
- * Version:	@(#)hdc.c	1.0.16	2018/10/17
+ * Version:	@(#)hdc.c	1.0.17	2018/11/18
  *
  * Authors:	Miran Grca, <mgrca8@gmail.com>
  *		Fred N. van Kempen, <decwiz@yahoo.com>
@@ -30,7 +30,6 @@
 #include "hdd.h"
 
 
-char	*hdc_name;		/* configured HDC name */
 int	hdc_current;
 
 
@@ -160,19 +159,10 @@ static const struct {
 
 /* Initialize the 'hdc_current' value based on configured HDC name. */
 void
-hdc_init(char *name)
+hdc_init(void)
 {
-    int c;
-
     hdc_log("HDC: initializing..\n");
 
-    for (c = 0; controllers[c].device; c++) {
-	if (! strcmp(name, (char *) controllers[c].internal_name)) {
-		hdc_current = c;
-		break;
-	}
-    }
-
     /* Zero all the hard disk image arrays. */
     hdd_image_init();
 }
@@ -211,6 +201,22 @@ hdc_get_internal_name(int hdc)
 }
 
 
+int
+hdc_get_id(char *s)
+{
+	int c = 0;
+	
+	while (strlen((char *) controllers[c].name))
+	{
+		if (!strcmp((char *) controllers[c].name, s))
+			return c;
+		c++;
+	}
+	
+	return 0;
+}
+
+
 int
 hdc_get_from_internal_name(char *s)
 {