Added additional config options: "Minimum Meteor Size To Spawn Nether Portal", "Meteor Impact Explosion Multiplier" and "Meteor Impact Spread".

Added additional config options, with defaults that match the current mod behavior.

"Minimum Meteor Size To Spawn Nether Portal" (default 2)
Can disable portal creation by setting this higher than the "Maximum Meteor Size".

"Meteor Impact Explosion Multiplier" (0.0 - 20.0, default 5.0)
Allows for more or less powerful meteor crash explosions.

"Meteor Impact Spread" (0 - 8, default 4)
Control how much meteor ore is generated on impact.