Various Enhancements

- 60 second turn timer with a +1 card penalty if timer runs out
- !wait will turn timer off for your turn

- !p acts the same as !play
- To prevent invoking other bots in the channel I changed !help and !count to !unohelp and !unocount

- Added game modes:

 Attack mode (!uno +a):
   When a player !draw they have a 20% chance to be UNO Attacked.       When this happens they will draw anywhere from 0 - 7 cards!

 Extreme mode (!uno +e):
   This mode inserts twice as many special cards into the deck. Special cards include R, S, D2, W, and WD4.

 Both modes (!uno +a +e):
   Enables both Attack and Extreme modes in the game!