Add the Scorm2004::Sequencing::EvaluateRollupConditionSubprocess class.
typo

def_delegator => def_delegators
Add @example.
CheckChildForRollupSubprocess: let the initializer suspend taking parameters.

Instead, #call takes two parameters:

* activity
* rollup_action
Revert "CheckChildForRollupSubprocess: let the initializer suspend taking parameters."

This reverts commit 58020bc75ad6047bdd06d2ed31e3416006eff267.
Add the Scorm2004::Sequencing::RollupRuleCheckSubprocess class.
Add the Scorm2004::Sequencing::ObjectiveRollupUsingRulesProcess class.
Add the Scorm2004::Sequencing::ObjectiveRollupUsingDefaultRule class.