* Create a mechanism for logging mutation feedbacks.
* The mutation feedbacks are displayed as a toast by default.
* Apply this logging mechanism on the course homepage to provide
feedback for the results of actions performed on course modules and
course sections.
Now components has a new property lock to disable all user interactions.
This is applied directly into the course index and course content to
freeze an element if some action is performed over it. To set this
locked value there are 2 new mutations cmLock and sectionLock.
Now a reactive component could inherit the reactive instance from the
parent DOM element. This way components are more reusable. Apart, some
new state updates have been added. To the previous create, update and
delete, now the update message could provide also put and override,
making the state update message more REST alike and simplifying the
backend returns processing.
The new course creation for Moodle 4.0 requires to add
some leavel of reactivity to the frontend. Instead of
building a specific solution only for the course editor,
in this commit there's a generic solution that can be
used in other places in Moodle to implement single
state reactive components.
