Parsing Error messages refactor#331

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johnny-keker wants to merge 8 commits intomasterfrom

err-list-mult-loc

Commits on Sep 12, 2022

fixed parsing script errors with multiple locations
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Commits on Sep 15, 2022

returned old Message|null signature to parser functions, got rid of multiple locations error as well as
johnny-keker
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removed last <text>(<location>) error from tests
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