Expansion Requirement

Requirement to check if an expansion is enabled.

REQUIREMENT
{
    name = Expansion
    type = Expansion

    // The name of the expansion that the player must have installed.  If more
    // than one is specified, then the user must have all the listed expansions
    // installed.
    //
    // Type:      string
    // Required:  Yes
    // Values:
    //     MakingHistory
    //     Serenity 
    //
    expansion = MakingHistory
}