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Support Instance_num parameter of SUBSTITUTE function. Fixed issue #530 #531
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Enhances SUBSTITUTE() function with the fourth, optional parameter instance_num.
https://support.office.com/en-us/article/substitute-function-6434944e-a904-4336-a9b0-1e58df3bc332
Fixes #530
Added three unit tests (TextFunctionsTests.SubstituteShouldReplaceOnlyFirstInstance, TextFunctionsTests.SubstituteShouldReplaceOnlySecondInstance and StringFunctionsTests.SubstituteShouldReplaceOnlySecondInstanceFound) to verify this works.