(svn r6222) Remove struct ColorList, because the names of its attributes are plain confusing

All the struct holds is a simple colour gradient, so using a simple array with 8 entries is more clear
Also add the names of colour the gradients as enum

main_gui.c

@@ -2349,7 +2349,7 @@ void SetupColorsAndInitialWindow(void)
 		const byte *b = GetNonSprite(PALETTE_RECOLOR_START + i);
 
 		assert(b);
-		_color_list[i] = *(const ColorList*)(b + 0xC6);
+		memcpy(_colour_gradient[i], b + 0xC6, sizeof(_colour_gradient[i]));
 	}
 
 	width = _screen.width;