Test launcher fixes and improvements

This PR fixes an issue with the form used by the launcher to ask for the test classpath: it did not include the version number parameter in the URL when using dev files.
This PR also adds the ability to change the `isAmaBuild` flag from the URL (by using `-` or `.` in the second part of the version number).
This PR also extends the pattern of `isAmaBuild` URLs to include any path which follows the `/aria-templates-something` pattern (instead of only `/aria-templates-dave` and `/aria-templates-dev`).
Finally, this PR adds the Aria Templates version number on the page.