graphics/lximage-qt: update to 0.15.0

lximage-qt-0.15.0 / 2020-04-21
==============================
  * Hide annotations toolbar by default (it's buggy) but add an option to show/hide it on startup.
  * No auto-selection in thumbnail view.
  * Fixed showing the first image on loading a directory.
  * String optimizations.
  * Optionally show image outline.
  * More complete transformation based on EXIF.
  * Prevent blurry images with HDPI.
  * Jump forward when the image is deleted/renamed.
  * Added command-line option `-d` to take a screenshot and save it to the directory  without showing the GUI.
  * Remove X11 screenshot under Wayland.
  * Made maximum number of recent files configurable.
  * Support uploading of unsaved images.
  * No multiple Preferences dialogs.
  * Keep zooming state on switching image.
  * Removed deprecated `QDesktopWidget`.
  * Added "Open With.." to File menu.
  * Added shortcut editor to Preferences.
  * Fixed maximization at startup with SVG and GIF images.

(pin)