using URLSearchParams to get url parameters in js

[Cecilia Vela Gurovic]

we have a function in js/mahara.js called getUrlParameter(param, url)

We should update that one to use this " new URLSearchParams() " seen as it's valid for every browser except old IE (which we don't support) https://developer.mozilla.org/en-US/docs/Web/API/URLSearchParams

Actually we could also update our updateUrlParameter() as the URLSearchParams() can do get() and set()

[Mahara Bot (dev-mahara)]

Patch for "master" branch: https://reviews.mahara.org/10695

[Mahara Bot (dev-mahara)]

Reviewed: https://reviews.mahara.org/10695
Committed: https://git.mahara.org/mahara/mahara/commit/a94f1fa1899679e73dea315400365d8b2e1e2930
Submitter: Robert Lyon (<email address hidden>)
Branch: master

commit a94f1fa1899679e73dea315400365d8b2e1e2930
Author: Cecilia Vela Gurovic <email address hidden>
Date: Tue Dec 31 10:24:13 2019 +1300

Bug 1852026: refactor getUrlParameter(param, url)

to use JS function URLSearchParams. The result should stay the same, it should not change any behaviour.

The function is used in :
./htdocs/relatedtags.php
./htdocs/tags.php
./htdocs/js/adminusersearch.js
./htdocs/js/export.js
./htdocs/js/privacy.js
./htdocs/js/adminexportqueue.js
./htdocs/artefact/annotation/blocktype/annotation/js/annotation.js
./htdocs/artefact/plans/js/planview.js
./htdocs/artefact/peerassessment/blocktype/peerassessment/js/peerassessment.js
./htdocs/artefact/file/js/filebrowser.js
./htdocs/theme/raw/js/formtabs.js
./htdocs/view/choosetemplate.php

the function updateUrlParameter is used in:
./htdocs/relatedtags.php
./htdocs/js/privacy.js
./htdocs/js/mahara.js
./htdocs/artefact/file/js/filebrowser.js

behatnotneeded

Change-Id: I1593f59624a5de3f90054a702d4e94dd7029f321