warning_icon.svg
- from http://commons.wikimedia.org/wiki/File:Warning_icon.svg
- by http://commons.wikimedia.org/wiki/User:Amada44
- license: public domain

open.png,svg
- from https://github.com/FortAwesome/Font-Awesome/blob/6.x/svgs/regular/folder-open.svg
- license: https://github.com/FortAwesome/Font-Awesome (CC BY 4.0 License , SIL OFL 1.1 License , MIT License ), https://github.com/FortAwesome/Font-Awesome/blob/6.x/LICENSE.txt
- remade to open-thin.svg by Michalis

walk.svg based on
- http://www.openclipart.org/people/ryanlerch/ryanlerch_No_entry_sign_with_a_man.svg
- by ryanlerch
- license: public domain
- modified heavily by Kambi (who takes responsibility for all the ugliness
  caused by his editing :) (using Inkscape)

examine.svg based on
- http://commons.wikimedia.org/wiki/File:Necker_cube.svg
- license: Creative Commons Attribution-Share Alike / GNU FDL >= 1.2
- modified by Kambi (using Inkscape)

fly.svg
- from http://commons.wikimedia.org/wiki/File:Falco-peregrinus-silhouette.svg
- license: Creative Commons Attribution-Share Alike / GNU FDL >= 1.2

animations.png https://feathericons.com/
- https://github.com/feathericons/feather
- Copyright (c) 2013-2017 Cole Bemis
- Licence: MIT https://github.com/feathericons/feather/blob/master/LICENSE
