Added the 3Com 3C503 Network card;

Several bug fixes;
Preliminar addition of the SDL 2 renderer (does not yet work correctly in full screen mode);
SCSI devices no longer have configurable LUN's (this matches the configurability of real SCSI devices);
SCSI LUN's are now handed by the device's handler;
Removed all unused strings;
Removed some unused code files;
Significantly rewrote the bus mouse emulation.

src/sound/midi_fluidsynth.c

@@ -247,7 +247,7 @@ void* fluidsynth_init(const device_t *info)
 #endif
 	if (fluidsynth_handle == NULL)
 	{
-		ui_msgbox(MBX_ERROR, (wchar_t *)IDS_2171);
+		ui_msgbox(MBX_ERROR, (wchar_t *)IDS_2081);
 		return NULL;
 	}