CopyCommand currently does three things:
* Given a value and a key it overrides an existing key for that value. If no key is given, it associates the value with null
* Given a key, but no value, it removes the key and it's value from the context
* Given a fromKey and a toKey, it copies the value from fromKey to toKey
This should be split up into three distinct commands: OverrideCommand, RemoveCommand and CopyCommand
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