Challenging tracker

Tracks Challenging Shout and Challenging Roar used in raid, showing 10 min cooldown bars for each with name of person who used each.  

CAVEAT: WA does not communicate in the background with other group members, so tracking is specific to each WA user.  Therefore if you reload UI or open WA config window, current tracking bars will disappear.  New ones will be added once the next Challenging Roar/Shout is detected in combat event log.

Currently the WA activates only in raid and only for warrior and rogue classes.  You can change that in the Load tab.

TO CHANGE RAID ANNOUNCEMENTS:  (see screenshot for guidance)
- Go to Actions tab for each sub-aura and uncheck send message On Show   if you don't want to send a raid message
- OR in the same place you can change Raid Warning to Raid (for example if you don't have assist but still want to announce to raid chat)
- There's an optional announcement for cooldown expiration ("On Hide") that says "layer, but it malfunctions when you reload UI or open WA config window, so it's been left disabled.  By malfunctions, I mean that it sends out chat messages that all active Challenging cooldowns have expired, when in fact they are still ongoing.  This happens because WA pauses/stops tracking when WA config window is open, so it "hides" the aura, and hence the On Hide message is shown.