Add neat interface for trusting devices

[vanitasvitae]

I imagine something like this:

/trust jid@server.tld

-->

jid@server.tld
---------------------
                                        trust   distrust  undecided                                                                     
12345678 abcdefab 1f1f1f1f abababab
44444444 bbbbbbbb dddddddd ffffffff      [ ]       [ ]       [*]

87654321 fedcbafe ff11ff11 aabbaabb
55555555 cccccccc eeeeeeee aaaaaaaa      [*]       [ ]       [ ]