added s4mari:EventProperty class to ensure continuity in hierarchy between subclasses of saref:FeatureOfInterest and saref:Property

added s4mari:EventKind and s4mari:AgentKind classes to ensure continuity in hierarchy between subclasses of saref:FeatureOfInterest and saref:FeatureKind

added links to corresponding CISE classes in CISE Core Vocabulary Specification for s4mari classes via rdfs:seeAlso

created s4mari class hierarchy diagram and seperate class hierarchy diagrams for Property, FeatureKind and FeatureOfInterest