Backport fix for #496 and #361 - event clients lost after dev restart

Summary of changes comparing to original commits:

• Correction for #496 (closed) (backport of #573):
  • 6c225211 - test only
  • 8712a7aa - Event names are passed instead of event type enums to avoid changing set_client_lib signature
  • 71151114 - I needed to provide a new struct next to EventPar and implement a set of overloads that use the new struct and attribute_name field instead of attr_id
• Correction for #361 (closed) (dependent on previous one, backport of #694):
  • 39500631 - test only
  • b3069622 - no changes