The `page_type_list` method for the message component was deprecated
in 5b0769db as part of MDL-54744. However it is still required when
trying to configure blocks on any messaging pages.

This implementation will include the correct
autocomplete attribute value so that the password
managers can aid in creating good secure passwords
and not get confused with other autocomplete types.
There are some changes the password type form so
that autocomplete attribute can be passed an array.

The module now exports a getCourseEditor and a getCurrentCourseEditor
methods. The module is more consistent as it can be used to get
other course than the current one.

This patch fix the subcription page only adding the course parameter
only when viewing the calendar on course context. It also passes the
url to the form instance, so we have the course parameter on the
form action attribute.