Let net.minecraft.util.IChatComponent extend Iterable<IChatComponent> instead of Iterable

[mist475]

Not sure how to do this myself, otherwise I'd have opened a pr for this instead

[eigenraven]

Right now changing superclasses is not very easy, or even possible in multiple cases, because it involves patching out the synthetic bridge methods out of the originally decompiled sources. I'll take a look if this is the case for this mapping too, but it might have to be put on hold until my bigger rewrite that no longer relies on the decompiler to work.