* move util function to util module
* move playwright config file to tracker dir root
* update Playwright + add gitignores
* Playwright: enable reuseExistingServer (non-CI env)
* store tracker src copies to avoid re-compilation in dev env
* test pageleave on simple navigation
* fix test util fn
* rename local_test npm script
* make test util able to expect multiple requests
* test pageleaves in SPAs
* test pageleave with manual URL
* test pageleave not sent in manual when pageview not triggered
* extend util fn to refute event requests
* test pageleaves not sent in excluded hash pages
* store hashes instead of file copies to detect /tracker/src changes
* drop async
* speed up test suite
