Support SHR video modes with a VidHD card (#997, PR #1004)

Support VidHD in slot 3 (via Config GUI or '-s3 vidhd') for SHR video modes only.
- AppleWin window is slightly enlarged when VidHD card is inserted.
Support IIgs 320x200 (and fill mode) and 640x200 video modes.
Debugger: add 'shr' command to view video
CUI: Allow user to specify width & height (for full-screen); and allow separate x,y scaling in full-screen mode.

source/Configuration/PropertySheetHelper.cpp

@@ -548,6 +548,8 @@ std::string CPropertySheetHelper::GetCardName(const SS_CARDTYPE CardType)
 		return "4Play";
 	case CT_SNESMAX:
 		return "SNES MAX";
+	case CT_VidHD:
+		return "VidHD";
 	default:
 		return "Unknown";
 	}