Added VGA grayscale and choose screen type

VGA render can transform to grayscale and applying color.
Green, amber and white.

src/WIN/resource.h

@@ -410,6 +410,11 @@
 #define IDM_VID_OVERSCAN	40076
 #define IDM_VID_INVERT		40079
 #define IDM_VID_CGACON		40080
+#define IDM_VID_GRAY_RGB	40090
+#define IDM_VID_GRAY_MONO	40091
+#define IDM_VID_GRAY_AMBER	40092
+#define IDM_VID_GRAY_GREEN	40093
+#define IDM_VID_GRAY_WHITE	40094
 
 #define IDM_LOG_BREAKPOINT	51201
 #define IDM_DUMP_VRAM		51202	// should be an Action