add /clocate command

[Domkeykong]

trafficstars

Basically it does the same as the /locate command, but you have to give it the World Seed as an argument.

[OneYellowLemon]

I think that if you already have the world seed then you should just put it into Amidst or likewise and then Earth doesn't have to update the code every time world gen is tweaked.

[Earthcomputer]

Closely related to #56 and #85

[Earthcomputer]

Also Lemon that is a pretty silly comment, as clientcommands is a mod it can just use Minecraft's algorithm directly

[OneYellowLemon]

Oh yeah I didn't think about that. Oh well...