StEP 3348, closes #3348

app/views/lti/_tool_info.php

app/views/lti/tool/add.php

app/views/lti/tool/edit.php

app/views/lti/tool/index.php

composer.json

composer.lock

db/migrations/6.0.39_add_lti13a.php

db/studip_default_data.sql

lib/classes/LTI13a/Identity.php

lib/classes/LTI13a/KeyChainFactory.php

lib/classes/LTI13a/KeyManager.php

lib/classes/LTI13a/LineItemRepository.php

lib/classes/LTI13a/NonceGenerator.php

lib/classes/LTI13a/PlatformManager.php

lib/classes/LTI13a/Registration.php

lib/classes/LTI13a/RegistrationManager.php

lib/classes/LTI13a/ResultRepository.php

lib/classes/LTI13a/ScoreRepository.php

lib/classes/LTI13a/UserAuthenticator.php

lib/classes/auth_plugins/StudipAuthLTI.php