Auto-switch DiskII firmware to 13 or 16 sector depending on disk in drive-1 (#734) (PR #761)

. The auto-switch is done on each reset, or on inserting a disk at the start-up screen (MODE_LOGO).
. The Window's title include '(S6-13)' if DiskII card has 13-sector f/w.
. The debugger's 'disk info' cmd will show FW13 or FW16 depending on f/w.

source/Disk2CardManager.cpp

@@ -118,3 +118,17 @@ void Disk2CardManager::Destroy(void)
 		}
 	}
 }
+
+bool Disk2CardManager::IsAnyFirmware13Sector(void)
+{
+	for (UINT i = 0; i < NUM_SLOTS; i++)
+	{
+		if (g_CardMgr.QuerySlot(i) == CT_Disk2)
+		{
+			// If any Disk2 card has 13-sector firmware then return true
+			if (dynamic_cast<Disk2InterfaceCard&>(g_CardMgr.GetRef(i)).GetCurrentFirmware() == 13)
+				return true;
+		}
+	}
+	return false;
+}