ircbrowse should allow you to hide join/part messages

[Gurkenglas]

These https://github.com/chrisdone/ircbrowse/search?utf8=%E2%9C%93&q=focused seem to be the critical sections of code, except that you would need to filter for this before you count how many entries to display on this page ( https://github.com/chrisdone/ircbrowse/blob/b69be2d8c9dd8826a42e6c101d81250c0c64ffc9/src/Ircbrowse/Controllers.hs#L147 )

[neongreen]

Already reported: https://github.com/chrisdone/ircbrowse/issues/15. It'd be nice, yeah, but I don't have time to make a pull request right now.