Add the Scorm2004::Sequencing::RollupControls module.

This module will be included in the activity class, and provides Rollup
Controls elements.
Add the Scorm2004::Sequencing::MeasureRollupProcess class.
Add the Scorm2004::Sequencing:CompletionThreshold module.

This module will be included in the activity class.
Add the Scorm2004::Sequencing::CompletionMeasureRollupProcess.