Add allowUnusedVariablesInFileScope option #229
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This was referenced Mar 16, 2021
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As reported by @djibarian in #228, there are instances where one might want to ignore unused variables in the global (file-level) scope. Since we already have a
allowUndefinedVariablesInFileScopeoption to disable half of the file scope functionality, it makes sense to also include aallowUnusedVariablesInFileScopeoption to disable the other half. This PR adds that option.