* pan if the image is zoomed instead of navigating away
quickly display full landscape image before zooming to fit height in fit to screen
* add Tap to pan preference, defaults to true
add landscape zoom preference, defaults to false
* hide landscape image zoom option if scale is not fit screen
* fix landscape image zoom for first image and loading image
* properly reload pagerholders when landscape zoom option is changed
* enable landscape zoom by default
d8719ceee9