Upgrade bbb-lti and make it standalone.

bbb-lti/.gitignore

bbb-lti/application.properties

bbb-lti/gradle.properties

bbb-lti/gradlew

bbb-lti/gradlew.bat

bbb-lti/grails-app/assets/javascripts/application.js

bbb-lti/grails-app/assets/stylesheets/application.css

bbb-lti/grails-app/assets/stylesheets/errors.css

bbb-lti/grails-app/assets/stylesheets/main.css

bbb-lti/grails-app/assets/stylesheets/mobile.css

bbb-lti/grails-app/conf/BuildConfig.groovy

bbb-lti/grails-app/conf/DataSource.groovy

bbb-lti/grails-app/conf/application.groovy

bbb-lti/grails-app/conf/logback.xml

...-app/controllers/org/bigbluebutton/lti/UrlMappings.groovy

...s/org/bigbluebutton/lti/controllers/ToolController.groovy

bbb-lti/grails-app/i18n/messages.properties

bbb-lti/grails-app/i18n/messages_es.properties

bbb-lti/grails-app/i18n/messages_fr.properties

bbb-lti/grails-app/init/org/bigbluebutton/BootStrap.groovy