Split off the Network configuration from Other peripherals in the Settings dialog and made PCap device configurable;

Overhauled the configuration files so that the global variables are now subdivided into sections;
Fixed CD-ROM MODE SENSE page 0x2A which was being incorrectly reported as not implemented, fixes among other things Rayman 1 and Spellcross: The Last Battle (both now see the CD-ROM and play CD Audio fine).

src/network.c

@@ -215,5 +215,5 @@ network_card_get_from_internal_name(char *s)
 	c++;
     }
 	
-    return(0);
+    return(-1);
 }