[NX-470] Hooks or events for alarm state change

http://www.netxms.org/forum/general-support/create-event-with-acknowledgements/

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**Migrated from track.radensolutions.com**

- **Original Issue:** NX-470
- **Type:** Feature
- **State:** Fixed
- **Priority:** Normal
- **Subsystem:** Server
- **Created:** 2014-10-16 20:00:05 UTC
- **Updated:** 2020-06-12 11:18:16 UTC
- **Reporter:** Victor Kirhenshtein (@2128506)
