Port of the reworked svga memory addressing, normal chain4 mapping and ma13/14 mapping for non-CGA modes.

Fixed ET4000/W32 (without letters) hardware cursor.
Fixed non-interlaced 1280x1024x8bpp Cirrus mode in the 5434.
Added a note regarding the Radius (HT209) 8bpp render.
Reworked the TGUI9440, but still WIP.

src/video/vid_et4000.c

@@ -742,6 +742,8 @@ et4000_init(const device_t *info)
 
     dev->svga.translate_address = get_et4000_addr;
 
+	dev->svga.packed_chain4 = 1;
+
     return(dev);
 }