Implement [LegacyLenientSetter] and fix [LegacyLenientThis] #210
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For [LegacyLenientThis], this fixes an issue where it would still try to get the impl value, even when the thisArg did not pass the is() check, resulting in a TypeError.
This also adds test coverage for [LegacyLenientThis] and [Replaceable], as part of #207.
This was originally #209 but that PR was sent from an organization and thus not acceptable for this project.