Applied all relevant PCem commits;

Extensively cleaned up and changed the CD-ROM code;
Removed CD-ROM IOCTTL (it was causing performance and stability issues);
Turned a lot of things into device_t's;
Added the PS/1 Model 2011 XTA and standalone XTA hard disk controllers, ported from Varcem;
Numerous FDC fixes for the PS/1 Model 2121;
NVR changes ported from Varcem;
The PCap code no longer requires libpcap to be compiled;
Numerous fixes to various SCSI controllers;
Updated NukedOPL to 1.8;
Fixes to OpenAL initialization and closing, should give less Audio issues now;
Revorked parts of the common (S)VGA code (also based on code from QEMU);
Removed the Removable SCSI hard disks (they were a never finished experiment so there was no need to keep them there);
Cleaned up the SCSI hard disk and Iomega ZIP code (but more cleanups of that are coming in the future);
In some occasions (IDE hard disks in multiple sector mode and SCSI hard disks) the status bar icon is no longer updated, should improve performance a bit;
Redid the way the tertiary and quaternary IDE controllers are configured (and they are now device_t's);
Extensively reworked the IDE code and fixed quite a few bugs;
Fixes to XT MFM, AT MFM, and AT ESDI code;
Some changes to XTIDE and MCA ESDI code;
Some fixes to the CD-ROM image handler.

src/scsi/scsi_device.h

@@ -8,7 +8,7 @@
  *
  *		Definitions for the generic SCSI device command handler.
  *
- * Version:	@(#)scsi_device.h	1.0.6	2018/03/07
+ * Version:	@(#)scsi_device.h	1.0.7	2018/03/29
  *
  * Authors:	Miran Grca, <mgrca8@gmail.com>
  *		Fred N. van Kempen, <decwiz@yahoo.com>
@@ -39,6 +39,7 @@ extern int64_t	scsi_device_get_callback(uint8_t scsi_id, uint8_t scsi_lun);
 extern void	scsi_device_request_sense(uint8_t scsi_id, uint8_t scsi_lun,
 					  uint8_t *buffer,
 					  uint8_t alloc_length);
+extern void	scsi_device_reset(uint8_t scsi_id, uint8_t scsi_lun);
 extern int	scsi_device_read_capacity(uint8_t id, uint8_t lun,
 					  uint8_t *cdb, uint8_t *buffer,
 					  uint32_t *len);