Butterfly Mania \o/

- One new butterfly graphics
- New Activity-System that should be used for any Animal AI
- Butterflies have now 4 different behaviors (sorted by priority):
  - Escape the players when Sitting (during Feed or Sleep)
  - Go Sleep in the Night
  - Fly to flowers and feed when hungry
  - Glide once in a while
  - Otherwise Fly Around somewhat more intelligently than before