Implement text zooming in the lister

[ghisler(Author)]

This used to work for numeric pad 0 too, but TC beta 2 ignores the key.

This has already been reported in the bugs forum.

Additionally, it might be nice to see the image size in the caption

Unfortunately the zoom sport used for images is already used for the percentage within the file for text files.

[browny]

The idea was different, simply the original image size in caption, maybe like Lister - [c:\file.ext], 120x200.