Ueberzug is a command line util which allows one to draw images on
terminals by using child windows.

Advantages over the w3mimgdisplay program:
- no race conditions as a new window is created to display images
- expose events will be processed, so images will be redrawn on
  switch workspaces
- tmux support (excluding multi pane windows)
- terminals without the WINDOWID environment variable are supported
- chars are used as position - and size unit
- no memory leak (/ unlimited cache)