Arena Calculator

• New Feature: Optional recoloring in the PVP frame. (Default set to off)

* New slash commands:
   /acalc show - show the Arena Calculator frame
   /acalc scale # - set the scale of the Arena Calculator frame (0.3 - 2.0)
   /acalc teams - print arena teams information in the chat
   /acalc rating # - calculate rating-to-points in the chat
   /acalc points # - calculate points-to-rating in the chat
* Created an optionsframe with these settings available:
   show/hide total arena points
   show/hide team specific arena points
   show/hide Arena Calculator button
   recoloring on/off
   scale of the Arena Calculator frame
* Fixed the total arena points feature to ignore teams where player is not eligible for any arena points.
* Made some cleanups in the code.
* When calculating points, the decimals will now be dropped instead of rounded off, because I don't know how Blizzard round the value off. Better to gain one point more than expected rather than one less.