feat(JISC): Adds jisc extensions behind `send_jisc_data` setting. (#547)

classes/log/store.php

lang/en/logstore_xapi.php

settings.php

src/transformer/events/all/course_module_viewed.php

src/transformer/events/core/course_completed.php

...nsformer/events/core/course_module_completion_updated.php

src/transformer/events/core/course_viewed.php

src/transformer/events/core/user_created.php

src/transformer/events/core/user_enrolment_created.php

src/transformer/events/core/user_loggedin.php

src/transformer/events/core/user_loggedout.php

src/transformer/events/mod_assign/assignment_graded.php

src/transformer/events/mod_assign/assignment_submitted.php

src/transformer/events/mod_book/chapter_viewed.php

src/transformer/events/mod_book/course_module_viewed.php

src/transformer/events/mod_chat/course_module_viewed.php

src/transformer/events/mod_facetoface/cancel_booking.php

...ransformer/events/mod_facetoface/course_module_viewed.php

src/transformer/events/mod_facetoface/signup_success.php

src/transformer/events/mod_facetoface/take_attendance.php