Allow LTI submissions to be revoked if not graded

[Matt Clarkson]

Add the ability for learners to 'un-submit' their LTI submissions if they have not yet been graded.

[Mahara Bot (dev-mahara)]

Patch for "master" branch: https://reviews.mahara.org/10333

[Mahara Bot (dev-mahara)]

Patch for "master" branch: https://reviews.mahara.org/10338

[Mahara Bot (dev-mahara)]

Reviewed: https://reviews.mahara.org/10333
Committed: https://git.mahara.org/mahara/mahara/commit/17e7e95f481f727351d54b41c819279b93fb9314
Submitter: Robert Lyon (<email address hidden>)
Branch: master

commit 17e7e95f481f727351d54b41c819279b93fb9314
Author: Matt Clarkson <email address hidden>
Date: Thu Jul 11 08:32:36 2019 +1200

Bug 1836653: Allow LTI submissions to be revoked

Change-Id: Ib0a677db1b04b328f0e679cffa0c4d52fa52ecee

[Mahara Bot (dev-mahara)]

Reviewed: https://reviews.mahara.org/10338
Committed: https://git.mahara.org/mahara/mahara/commit/61d8ca02aed8a9f509b3a5d2de7a95469a896fc1
Submitter: Robert Lyon (<email address hidden>)
Branch: master

commit 61d8ca02aed8a9f509b3a5d2de7a95469a896fc1
Author: Robert Lyon <email address hidden>
Date: Thu Sep 12 13:16:57 2019 +1200

Bug 1836653: Allow revoked LTI submissions not send email to self

behatnotneeded

Change-Id: I0a72f702e63b650e302170072860a1e21cffec88
Signed-off-by: Robert Lyon <email address hidden>