Moved management of "most_recent_ref_trigger_meta_" to SampleMetaData

and removed option to change RefMetaTriggerEvents during runtime.

This will prevent a crash where several buffer managers read/write std::shared_ptr<SampleMetadata> lastRefMetaTrigger_;

To be cherry-picket to 7.0.0 acc7 branch and to be modified to apply on 6.1.x branch.

This change as well will require minimal changes on the FESA class to compile. No separate method "setRefTriggerEvents" anymore, removed possibility to change them during runtime --> Fesa Property ConfigureRefTriggerEvents now is obsolete and can be dropped.