bbb-lti: Rework on the way XML is parsed in order to fix issue with getRecording

bbb-lti/.asscache

bbb-lti/.gitignore

bbb-lti/application.properties

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

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

...s-app/controllers/org/bigbluebutton/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

...pp/services/org/bigbluebutton/BigbluebuttonService.groovy

...i/grails-app/services/org/bigbluebutton/LtiService.groovy

bbb-lti/grails-app/views/tool/error.gsp

bbb-lti/grails-app/views/tool/index.gsp