Nether chickens should immune to fire

[mser7]

Issue Description:

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Steps to reproduce (important):

1. Go into Nether
2. Chickens that spawn there die shortly after they step into fire or lava

What happens:

Provided above

What you expected to happen:

Nether chickens, or fire chickens(Blaze, lava, obsidian...) should immuned to fire damage

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Affected Versions (Do not use "latest"):

-Chickens: beta 6.1.0
-Minecraft: 1.12.2
-Forge: 14.23.4.2760

[GenDeathrow]

it was actually set up in the code for that.. but the part to actually make it immune wasn't there. So it will get patch. but I am make a big change to the spawning rules. So the update will be a while.