Review import statements for student code

[hollasch]

[Imported from original tealsMC repo]

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Steve [hollasch]:
For each new file that students will write, enumerate the import statements they'll be using. This way we don't have to reference types like net.minecraft.world.World, and can just say World.

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Connor [chollasch]:
It is quite possible that the majority of their imports will be via the net.minecraft package so we could even wildcard import all of the net.minecraft classes with the following:

import net.minecraft.*;

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Michael [hawkerm]:
It won't grab subpackages that way though so in the example above they'd still need to import net.minecraft.world.* still too. We run into this with Space Battle too, but only have three packages they need at most throughout the project.

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Steve [hollasch]:
Three packages should cover us as well, then.