[✨] Improve ability to run tests with all supported libraries & versions

[techfg]

Is your feature request related to a problem and/or adding functionality? Please describe

In order to execute tests against the various supported libraries & versions manual modification of imagemapster-test-runner.html is required. While the changes are trivial, it's a cumbersome step that often results in code changes not being tested against all the support libraries.

Describe the solution you'd like

Provide a library chooser at the top of the page to make executing tests against all supported libraries simpler.

Describe alternatives you've considered

Only alternative is manual manipulation of the html to load the different library/version.

Additional context

N/A