[sr-dev] [kamailio/kamailio] $xavi(...) (#2337)

[Victor Seva]

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#### Description

This change introduces a new type of variable $xavi - eXtended Attribute Value Insensitive case.
It's like a $xavp but keys are case insensitive:

```
$xavi(WhatEver=>fOo) = 1;

if($xavi(whatever[0]=>foo) == 1) {
....
}
```
You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/2337

-- Commit Summary --

  * core: xavi api - like xavp but with insensitive case names
  * core: pv - define xavi types
  * core: receive - reset xavi list after message processing
  * tm: process xavi list in transaction contexts
  * pv: $xavi(...) config variables implementation

-- File Changes --

    M src/core/pvar.h (4)
    M src/core/receive.c (1)
    M src/core/xavp.c (987)
    M src/core/xavp.h (43)
    M src/modules/pv/pv.c (539)
    M src/modules/pv/pv_xavp.c (416)
    M src/modules/pv/pv_xavp.h (7)
    M src/modules/tm/h_table.c (12)
    M src/modules/tm/h_table.h (3)
    M src/modules/tm/t_hooks.c (6)
    M src/modules/tm/t_reply.c (7)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/2337.patch
https://github.com/kamailio/kamailio/pull/2337.diff

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