Add BlockDecayEvent instead LeavesDecayEvent

[AkmalFairuz]

Description

Add event to handle block decay event include Flowing Water and Flowing Lava decay.

Justification

We cannot handle flowing water or lava when decay, only Leaves can handle

Alternative methods

Register new Water Block then put custom event when setBlock into air

[dktapps]

Lava and water don't decay. Lumping this behaviour in with Leaves decay would be wrong and misleading.

[AkmalFairuz]

I mean Flowing Water and Lava

[dktapps]

I know what you mean. My point stands.

[AkmalFairuz]

So , May I create pull request about this issue?

[dktapps]

Asking if you can create a pull request kind of defeats the object of making a pull request...