Element is on edge of browser. Changing window size.

This change adds configuration for the eslint-jsdoc plugin in order to
detect the following errors with jsdoc blocks:
* missing params
* params in incorrect order
* params with no type defined
* properties incorrectly defined
* incorrect use of @package
* incorrect values for @access

In addition, warnings will be thrown where indentation is incorrect.

 - Create new web services for manage subscription (Update calendar subscription)
 - Modified delete subscription feature to use Web service.
 - Midified update subscription feature to use in-place editbale
 - Delete subscription feature now have a confirmation box before processing.
 - Fixed some accessibility issues
 - Used 'Delete' instead of 'Remove' for deleting subscriptions

Adrian Greeve authored Aug 26, 2021 and Peter Dias committed Oct 20, 2021

This makes sure that we are backwards compatible with plugins that
have extended the course or module settings navigation and have
containers.

For cache types which mean this information can be obtained without a
significant performance cost (i.e. just by calling strlen and not
having to serialize something that wasn't serialized already),
this change calculates the size of data read from or written to cache
in each request and includes it in the perfdebug table at bottom of
output (when that is turned on).

This supports the following cache types:

* File store
* Redis (only if caching is enabled)

Fixing regression of MDL-52206.

Notification message for students after questions have been manually graded.