Currently, the only way of getting the spawner causing the CreatureSpawnEvent is by looping through nearby blocks and checking if it's a spawner.

This is:
1. Inefficient
2. Bad because it may produce incorrect results if 2 spawners are placed next to each other.

I request that a method is made in CreatureSpawnEvent named for example, getBlock() which returns null by default but if the spawn cause is due to a spawner, it returns the spawner block.