Continued Smarter Zombies

To our friend @callmeinvalid

Some modifications and improvements were made to the code, and a mod configuration file was added, with some properties:

[SeeLightDuringNightProcedure]
#Zombies' search radius
#Range: 1 ~ 100
searchRadiusLight = 25
#Light threshold that zombies move toward
#Range: 0 ~ 15
lightThreshold = 7

[TellNearbyProcedure]
#Radius at which zombies alert other mobs
#Range: 1 ~ 50
alertRadiusTellNearby = 10

[OnPlayerBreakingBlockProcedure]
#Radius at which zombies notice a player breaking a block
#Range: 1 ~ 50
detectRadiusBlock = 10

[OnPlayerHurtProcedure]
#Radius at which nearby zombies notice that the player has been attacked
#Range: 1 ~ 100
alertRadiusHurt = 50

Besides that, zombie behavior near lights has improved. They will group together where there are lights and attack nearby players or entities (villagers). By default, I set a reasonable distance for this, otherwise there wouldn't be zombies in the dark. (You can use lava to attract them, haha.)