fix: set and clone Expression Environment after Expression cloning

[MineFact]

Overview

Fixes #2616

Description

This Pull Requests sets the WorldEditExpressionEnvironment after an Expression gets cloned to make sure that the Functions class remains its environment after cloning to not run into a NullPointerException.
When the Expression is cloned, the WorldEditExpressionEnvironment gets cloned as well while making sure that the offset of the environment is not changing during the cloning process.

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[SirYwell]

A few small suggestions

[PierreSchwang]

I'd say ExpressionEnvironment should implement Clonable, if there is already the clone method

[SirYwell]

Looks good, thanks!