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#### Description This PR adds support for $hfl(Diversion)[] and $hflc(Diversion).

This parse_diversion.c was inspired by [parse_pai_ppi.c](https://github.com/kamailio/kamailio/blob/master/src/core/parser/parse_ppi_p...). I am not sure if it's breaking the existing implementation and usage. I believe it does not.

During some experimentation with the hfl(name)[-1], I encountered weird behavior with negative indexing for the already supported headers like Via, Route, and Contact. -1 yields null and -2 yields the last one and so on. Separate PR can be introduced if necessary.

Any feedback is welcome.

You can view, comment on, or merge this pull request online at:

https://github.com/kamailio/kamailio/pull/3650

-- Commit Summary --

* parser: Extend diversion for multiple bodies * pv: Add hfl and hflc support for Diversion header

-- File Changes --

M src/core/parser/parse_diversion.c (149) M src/core/parser/parse_diversion.h (10) M src/modules/pv/pv_core.c (175)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/3650.patch https://github.com/kamailio/kamailio/pull/3650.diff