SAK-25381

Added support for Moodle's core LTI plugin, patched as per
https://tracker.moodle.org/browse/MDL-41724. This code is only activated
if an ext_lms parameter of ext-moodle-2 is supplied.


git-svn-id: https://source.sakaiproject.org/svn/basiclti/trunk@310504 66ffb92e-73f9-0310-93c1-f5514f145a0a