Strip down the old event system

This removes unused code, event types, IE pltypes, and event IE types
where possible and makes several functions private that were once
public. This includes a renumbering of the remaining event and IE types
which breaks binary compatibility with previous versions. The last
remaining consumers of the old event system (or parts thereof) are
main/security_events.c, res/res_security_log.c, tests/test_cel.c,
tests/test_event.c, main/cel.c, and the CEL backends.

Review: https://reviewboard.asterisk.org/r/2703/
(closes issue ASTERISK-22139)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@396887 65c4cc65-6c06-0410-ace0-fbb531ad65f3

include/asterisk/security_events_defs.h

@@ -36,11 +36,6 @@ extern "C" {
 
 /*!
  * \brief Security event types
- *
- * AST_EVENT_SECURITY is the event type of an ast_event generated as a security
- * event.  The event will have an information element of type
- * AST_EVENT_IE_SECURITY_EVENT which identifies the security event sub-type.
- * This enum defines the possible values for this sub-type.
  */
 enum ast_security_event_type {
 	/*!