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/CardManager.cpp

@@ -40,6 +40,7 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 #include "SAM.h"
 #include "SerialComms.h"
 #include "SNESMAX.h"
+#include "VidHD.h"
 
 void CardManager::InsertInternal(UINT slot, SS_CARDTYPE type)
 {
@@ -96,6 +97,9 @@ void CardManager::InsertInternal(UINT slot, SS_CARDTYPE type)
 	case CT_SNESMAX:
 		m_slot[slot] = new SNESMAXCard(slot);
 		break;
+	case CT_VidHD:
+		m_slot[slot] = new VidHDCard(slot);
+		break;
 
 	case CT_LanguageCard:
 	case CT_Saturn128K: