EventCompositeGetTopLevelStageStyleEvents Method
When an Event defines a StageStyleMapping, it means that all descendent shots fired within that Event
will have been fired on the same target and withing the same STAGE STYLE. This method returns a list of
EventComposites that have defined StageStyleMappings, and thus have distinct STAGE STYLES.
It is possible for this method to return a list of one EventCompsite, if the Event
itself defines a StageStyleMapping.
For exmaple, if you were to call this method on the top level of a 3P COF, the return should be the
stages for prone, standing, and kneeling.
A second example, if you were to call this method on the top level of a 1600 prone aggregate,
the return should be the events 50yd, 50m, dewer 50yd, dewer 100yd, and 100yd.