* [image file view] added a zoomer(enable users to zoom in/out the image)
* [image file view] added 'rotate'(rotate the image in counter-clockwise direction and save it)
* [image file view] fixup
* [image file view] keep the 'prev/next' icons displayed on top of the image which is zoomed in
* [image file view] improved the display of the 'image saved' tip
* [image file view] don't offer 'zoom in/out' & 'rotate' for images with errors
* [image file view] don't offer 'rotate' for PSD & HEIC files
* [image file view] enable HEIC files to be viewed online
