Add power attribute for projectiles

[cswhite2000]

Resolves #1232

Adds a power attribute for projectiles. If the projectile implements Explosive and a power is supplied it will set the explosive power to the specified amount.

Example usage:

<projectile id="throwable-fireball" name="Fireball" projectile="Fireball" power="5" velocity=".5" click="right" damage="8" cooldown="2s"/>

[Pablete1234]

I believe yield is the probability of items dropping, 1=100% of items, 0.5=50% items etc, not the power of the explosion

[arcadeboss]

I believe yield is the probability of items dropping, 1=100% of items, 0.5=50% items etc, not the power of the explosion

We did a test on CS's test server last night where he had hard-coded the value to 10. It was super explosive in both destruction of materials and allowing high Fireball jumping.

[cswhite2000]

I believe yield is the probability of items dropping, 1=100% of items, 0.5=50% items etc, not the power of the explosion

So the setYield on Explosive sets the explosion's power / explosion size.
While setYield on EntityExplodeEvent sets the block drop rate.

[Pablete1234]

I believe yield is the probability of items dropping, 1=100% of items, 0.5=50% items etc, not the power of the explosion

So the setYield on Explosive sets the explosion's power / explosion size. While setYield on EntityExplodeEvent sets the block drop rate.

Well, that sounds like a stupid decision on the bukkit api or other upstream sources, can we avoid passing it down to pgm?
What i mean by that is, can we not call it yield="x"?
Currently pgm has

<tnt>
  <power>5</power>
  <yield>0.5</yield>
</tnt>

and i wouldn't want that yield and this one to be confused.

Maybe just call it power (like tnt has)?

[cswhite2000]

Sure will do