Upgrade PDFjs from v2.2.228 to v2.6.346

[Doris Tam]

Looks like there are quite some changes.

https://github.com/mozilla/pdf.js/releases

[Mahara Bot (dev-mahara)]

Patch for "master" branch: https://reviews.mahara.org/11562

[Mahara Bot (dev-mahara)]

Patch for "master" branch: https://reviews.mahara.org/11599

[Doris Tam (doristam)]

I couldn't minify the new version using README.Mahara instructions. Used https://github.com/oci-labs/pdfjs-dist-viewer-min in replacement as it comes with a minified version that is upstreamed from the original pdfjs repo

[Mahara Bot (dev-mahara)]

Patch for "master" branch: https://reviews.mahara.org/11807

[Mahara Bot (dev-mahara)]

Patch for "master" branch: https://reviews.mahara.org/11818

[Mahara Bot (dev-mahara)]

Patch for "master" branch: https://reviews.mahara.org/11822

[Mahara Bot (dev-mahara)]

Patch for "master" branch: https://reviews.mahara.org/11848

[Mahara Bot (dev-mahara)]

Reviewed: https://reviews.mahara.org/11807
Committed: https://git.mahara.org/mahara/mahara/commit/5ee26af6fe925599c42612a4bd1146a755215ed0
Submitter: Robert Lyon (<email address hidden>)
Branch: master

commit 5ee26af6fe925599c42612a4bd1146a755215ed0
Author: Doris Tam <email address hidden>
Date: Wed May 26 10:43:42 2021 +1200

Bug 1915994: Upgrade PDF.js v2.8.335

Change-Id: Ib49676ba7be62df59fd6da4c85ddb7dc29db4842

[Mahara Bot (dev-mahara)]

Reviewed: https://reviews.mahara.org/11818
Committed: https://git.mahara.org/mahara/mahara/commit/b315e71ff5a39f22573c1c53e68bf8e63f1250c3
Submitter: Robert Lyon (<email address hidden>)
Branch: master

commit b315e71ff5a39f22573c1c53e68bf8e63f1250c3
Author: Doris Tam <email address hidden>
Date: Thu Jun 3 10:49:52 2021 +1200

Bug 1915994: Hide the pdfjs uplod buttons

To avoid confusion we should disable the upload/open button
because people might think they are uploading a pdf file
when they are not.

Cleaned up old changes nolonger applicable with this version

Change-Id: I0e562446e4742cc40e8ab2b9dc87e1578421072d

[Mahara Bot (dev-mahara)]

Reviewed: https://reviews.mahara.org/11848
Committed: https://git.mahara.org/mahara/mahara/commit/b5289cef2707662d4eab0a4da8cb21d777d258ee
Submitter: Robert Lyon (<email address hidden>)
Branch: master

commit b5289cef2707662d4eab0a4da8cb21d777d258ee
Author: Robert Lyon <email address hidden>
Date: Sat Jul 3 06:50:22 2021 +1200

Bug 1915994: Make the paths to pdfjs directories absolute

Also add style change to have base of pdf visible

Also fix some minor coding issues

Change-Id: I2a5eb907c8aa38799e2a40ae875efbace47cee59
Signed-off-by: Robert Lyon <email address hidden>

[Mahara Bot (dev-mahara)]

Reviewed: https://reviews.mahara.org/11822
Committed: https://git.mahara.org/mahara/mahara/commit/6ed9230e287ca4915cb52e92391750adbc1ec4d0
Submitter: Robert Lyon (<email address hidden>)
Branch: master

commit 6ed9230e287ca4915cb52e92391750adbc1ec4d0
Author: Doris Tam <email address hidden>
Date: Fri Jun 4 12:34:14 2021 +1200

Bug 1915994: allow internationalisation of pdfjs

Change-Id: Idde1f070c247febbcd7c6b4a7cd2c53caed3cfe0