Software contains non-free icons (licensing issue)

[bearbin]

I realise that the software contains some non-free icons sourced from iconmonstr.com. We should replace these icons with alternatives from a public domain source such as publicicons.org

[curioussavage]

I think http://fontawesome.io/icons/ is probably the best place. But choice of icons should probably wait until the site has a cohesive design, preferably to match cuberite.org IMO

[tigerw]

Now using Semantic icons, which are apparently from FontAwesome. I think this is fine now?

[bearbin]

FontAwesome seems to require attribution for their icons somewhere, which I don't think we have. Also, the LICENSE file still references iconmonstr, which needs to be updated if those icons have been removed.