Update Creeper AI - Githubissues

Added creeper ignition AI and sounds

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Pull Request description

The Creeper AI has been added to allowing the ignition functions to work properly. This PR will close #410

The following are the changes I have made:

When you are close to a creeper, it stops motion and begins to enlarge, readying for explosion
Backing away or fleeing from the entity will result in motion being resumed and the ignition being cancelled along with the fuse being reset to 30 ticks (vanilla behavior)
Creeper ignition cancellation distance has been updated to the explosion radius (vanilla behavior)
Fixed deprecated event call and changed to $event->call()
Added support for Charged Creepers in the future
Updated creeper explosion "power" to 3 instead of 2.8 (vanilla behavior)
Removed NBT saving and loading functions and replaced with constant values