Mob Statistic additions

Give little additions to some of the mobs such as the breedable mobs and to mobs that can be spawned such as the Warden and Wither. Instead of just having it show how many you killed and how many killed you, give us additions to the stats like how many times they were bred or spawned. Having a statistic to show how many times you spawned a Warden or Wither can lead to a small bit of showboating to friends about someone's daring feats rather than just have those encounters lost to time when every one of those events were an attempted feat.