Add a /color command to fix color for a nick
Add a muc_color section in the config file to permanently fix a color to a nick
Unset color with /color <nick> unset
Add nick_color_aliases (default: true), to look for color of aliases
Make it possible to change the nick of a user not in the room, and change color of its aliases
Merge branch 'master_rebased' of https://github.com/Perdu/poezio