Hastexo-xblock

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* [Enhancement] Add support for Apache Guacamole 1.5.2;
make it the new default version.

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* [Enhancement] Update requirements for Open edX Olive release.

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* [Bug fix] Restore the `paste` functionality by addressing
the related changes in the `guacamole-js` library.
* [Enhancement] Add support for copying text out from
the terminal using the Async Clipboard API.
This works on Mozilla Firefox at this time. Support
in other browsers may follow.

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* [Enhancement] Add internationalization support.

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* [Enhancement] Add learner email to stacklist view in the
admin page and include it in searchable fields.

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* [Enhancement] Add custom actions to the admin interface to
- clear the stacklog for selected stack(s),
- set status to `SUSPEND_COMPLETE` for selected stack(s).

Clearing the stacklog will be particulary useful in cases
we need to "reset" a lab usage timer, since the
time is accumulated by the stacklog entries.
Setting a status to `SUSPEND_COMPLETE` is a common fix for
stacks that end up in unexpected states.