This allows you to set your "sticky" chat channel, so that you will always return to the channel you want when you hit enter & not the channel that WoW decides to put you into. So no more /saying something that you meant for /guild, etc.
Made it save per Character, for servers that need different channels (i.e. for ironman using a channel vs guild)
8/26/2014 6.0 -- Warlords of Draenor
7/19/2016 7.0 -- Legion
9/10/2016 7.1 -- fix for instance chat