* Small cleanup to `/player` command
There should be no changes to users
* Use extracted `source` variable
* Inline another single-use small function
* Inline another trivial helper
* Import inner classes of the ActionPack
* Rename `literalargumentbuilder` variable
* Compact unnecessary three lines into one
* Inline `source.getServer` and pass `Vec3` to `createFake`
This gets outside of "just" the command, but it's fine
* Unpick name length constant
* Pass `Vec3` directly to `BlockPos.containing`