Add the ability to mark manual activity completion from the resource or activity view

This issue came up through QA testing. MDLQA-11562

With the reintroduced feature of navigating through a moodle course using previous and next buttons, some parts of content can be easily skipped over without the user being aware they are missing content.

When there are conditional activities set, the current behavior of the next and previous buttons is to ignore them and skip right over.

From the activity or resource view, you can't tell the status of the automated completion tracking, and you can't manually set completion tracking without returning the course homepage, and clicking it.

Since those activities and resources are just skipped over if you haven't done the requirements, I think there needs to be a way to know completion tracking status, and to mark it from the view.