royaleunit-ant-tasks: <royaleunit player=""/> attribute may be set to chromium, webkit, or firefox to test JS using Playwright

Playwright allows for headless testing of JS in browsers in a more consistent environment than the local user's random installed web browser, including allowing testing with local file paths without security errors/warnings.

If a custom executable is defined for the browser, that still takes precedence over the player attribute, same as before.
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