BLTI-204

Add new privacy flag

ext_sakai_privacy=visible | hidden

This gives the external tool the current setting for the current user 
for the current site.



git-svn-id: https://source.sakaiproject.org/svn/basiclti/trunk@120278 66ffb92e-73f9-0310-93c1-f5514f145a0a
BLTI-188

Add ext_sakai_provider_displayid if the display id is different than the
eid.



git-svn-id: https://source.sakaiproject.org/svn/basiclti/trunk@120279 66ffb92e-73f9-0310-93c1-f5514f145a0a