Add a scam link detector

[Matyrobbrt]

Due to the increase of scam links, this PR adds a detector for them, muting any user that sends one, and deleting their message.

[williambl]

Thanks a lot for the pull request, this is a much-needed feature! I have a couple of quibbles with the implementation but other than those it looks great :)

[Matyrobbrt]

I am not sure about the channel where the logging should be done, since the only one that had something to do with deletion was the requests_deletion one

[KiriCattus]

Tiz the same channel, currently we don't have a deleted/edited logger in the bot because the last time we did we used D4J and have not been able to get it working since so we only logged things the bot knew it was going to delete

[sciwhiz12]

Lots o' comments! 😄

[Matyrobbrt]

Is this ready to be merged?

[KiriCattus]

As long as @sciwhiz12 is happy (And Williambl already seems to be I think) then yeah :) If it fails to build I think there's some missing guild issues that I had to comment out after an update to JDA recently :s

Edit: And maybe some missing license headers coz of the gradle license task not being run yet

[Matyrobbrt]

Yea the build issues are your fault :P. I had to revert to before your commits in order to actually test the bot. And I forgot about the license header

[sciwhiz12]

Aside from one quibble, this looks to me.

All issues are marked as resolved :)