Fix media queries issue for the index / add fullscreen capability

[benoitchantre]

Add a new extension parameter: -baker-index-fullscreen

It forces the index view to use the size of the screen instead of the size needed by its content.
That way, you can use media queries for the index. Reference: issue 637.

You can also design an index that is not visually fullscreen (with a transparent background).

The index can be closed with a double-tap.

[nin9creative]

I will try to take a look at this. I know there was some lengthy discussion on this on the prior board. My only concern is the double tap behavior to close. Since the other index requires just a single tap outside the index frame to close it.

Will try to take a look.

[nin9creative]

@feralbob We might want to discuss this as well. The only thing I don't like is the fact that it changes the tap/double tap behavior to dismiss the Index