Updated ROM BIOS handling to use the external loader.

Several cleanups and fixes here and there.
Updated (Windows) UI to properly handle resets and changes in Settings.
Updated to no longer scan for roms at startup.

src/video/vid_table.c

@@ -8,7 +8,7 @@
  *
  *		Define all known video cards.
  *
- * Version:	@(#)vid_table.c	1.0.3	2018/02/22
+ * Version:	@(#)vid_table.c	1.0.4	2018/03/01
  *
  * Authors:	Fred N. van Kempen, <decwiz@yahoo.com>
  *		Miran Grca, <mgrca8@gmail.com>
@@ -167,6 +167,22 @@ video_cards[] = {
 };
 
 
+int
+video_detect(void)
+{
+    int c, i;
+
+    /* Make sure we have a usable video card. */
+    c = 0;
+    for (i=0; i<GFX_MAX; i++) {
+	gfx_present[i] = video_card_available(video_old_to_new(i));
+	c += gfx_present[i];
+    }
+
+    return(c);
+}
+
+
 void
 video_reset(int card)
 {