Test launcher fixes and improvements

This PR includes the following changes:
- it fixes an issue with the form used by the launcher to request the
test classpath (the URL did not include the version number parameter
when using dev files).
- it adds the ability to change the `isAmaBuild` flag from the URL
(by using `-` or `.` in the second part of the version number).
- it 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`).
- it adds the Aria Templates version number on the test page