tinytest2JUnit - Convert 'tinytest' Output to JUnit XML

Unit testing is a solid component of automated CI/CD pipelines. 'tinytest' - a lightweight, zero-dependency alternative to 'testthat' was developed. To be able to integrate 'tinytests' results into common CI/CD systems the 'tinytests'-object is converted to JUnit XML format. 'tinytest2JUnit' enables this conversion while staying lightweight, having only 'tinytest' as its dependency.