In some scenarios (e.g. MetaSwitch interop) the `display` field of callee-id should be left empty instead of being overwritten with the number.
As is done in other places, we allow for `_undef_` to mean "leave the field empty".

FS-10521 FS-10612 [mod_callcenter] Member exit reason set to EXIT_WITH_KEY when it should be TIMEOUT and only set EXIT_WITH_KEY if the key pressed is set at cc_exit_keys

Merge pull request #24 in FSA/freeswitch-advantage from ~ANDYWOLK/freeswitch-advantage:feature/FS-11086-move-libflite-to-pre-compiled-binaries to v1.8-fsa

* commit 'bc22749f':
  FS-11086: [Build-System] Move libflite to pre-compiled libraries on Windows.

Merge pull request #23 in FSA/freeswitch-advantage from ~ANDYWOLK/freeswitch-advantage:feature/FS-11085-update-curl-to-7.59.0-and-move-to to v1.8-fsa

* commit '316d603e':
  FS-11085: [Build-System] Update curl to 7.59.0 and move to pre-compiled binaries on Windows.

Merge pull request #22 in FSA/freeswitch-advantage from ~ANDYWOLK/freeswitch-advantage:feature/FS-11083-add-mod_cdr_sqlite-to-the-windows to v1.8-fsa

* commit '24d683a6':
  FS-11083: [Build-System] Add mod_cdr_sqlite to the Windows build.

Merge pull request #21 in FSA/freeswitch-advantage from ~ANDYWOLK/freeswitch-advantage:feature/FS-11082-add-mod_odbc_cdr-to-the-windows to v1.8-fsa

* commit '4ed164cb':
  FS-11082: [Build-System] Add mod_odbc_cdr to the Windows build.

Merge pull request #20 in FSA/freeswitch-advantage from ~ANDYWOLK/freeswitch-advantage:feature/FS-10980-update-lua-from-version-5.2.4-to to v1.8-fsa

* commit 'ef86aae1':
  FS-10980: [mod_lua] Update lua version to 5.3.4 and move it to pre-compiled binaries on Windows.

FS-11070: [mod_conference] Improve video bridge first two for mux mode -- add support for files playing in this mode #resolve

FS-11068: [mod_conference] Avatar members not supported on personal canvas leading to miscount #resolve

FS-10967: [mod_conference] chan var "conference_enter_sound" not working, only work when profile param active and being overridden #resolve

This reverts commit 7acc94be.

Revert "FS-11070: [mod_conference] Improve video bridge first two for mux mode -- add support for files playing in this mode #resolve"

This reverts commit 04296b57.

Merge pull request #19 in FSA/freeswitch-advantage from ~ANDYWOLK/freeswitch-advantage:feature/FS-11078-add-mod_say_-es_ar-fa-he-hr-hu-ja to v1.8-fsa

* commit 'fa2d236d':
  FS-11078: [Build-System] Add mod_say_(es_ar, fa, he, hr, hu, ja, pl, th) modules to the Windows build.