Add cpx_dummy_pid test helper
Add util time test utils
Add cpx_global utility
PT-48217223, 48217217 - Fix announce, voicemail recipe actions
Add externalizing of cpx_agent_event handling

* Part of PT-46433839: fix occupancy in ouc
* Remove support for mnesia agent event stats and dumping
* cpx_agent api has changed
* Move old cpx_agent_event to attic for reference