Merge pull request #1590 in FS/freeswitch from ~ANDYWOLK/freeswitch:FS-11396-use-proper-libv8-naming to master

* commit 'e77c445c':
  FS-11396: [mod_v8] Use proper libv8 naming.

* commit 'd9d763d2':
  FS-11397 [mod_rayo] add xmlns to exec <response> to make adhearsion's life easier.

Merge pull request #1588 in FS/freeswitch from ~ANDYWOLK/freeswitch:feature/FS-11394-hardware-encoder-support to master

* commit 'd541943e':
  FS-11394: [mod_av] Fix "restrict" regression.

Merge pull request #1587 in FS/freeswitch from ~ANDYWOLK/freeswitch:feature/FS-11394-hardware-encoder-support to master

* commit '0b2f72ff':
  FS-11394: [mod_av] Enable HW acceleration on Windows. Use FFmpeg 3.4.4 instead of libav.

FS-11393: [core] set record_trimmed_ms at the end of record_session if the file interface has this info available

Merge pull request #1584 in FS/freeswitch from ~ANDYWOLK/freeswitch:FS-11390-use-system-libcodec2 to master

* commit '60054009':
  FS-11390: [mod_codec2] Use system libcodec2.

* commit '4edd8a97':
  FS-11387 [mod_loopback] add null endpoint

FS-11382: [core] add switch_pool_strip_whitespace function to strip whitespace using pool allocation

the timebase logic is tighed to code internal logic and cannot be changed externally

Merge pull request #1492 in FS/freeswitch from ~HUNYI/freeswitch:bugfix/FS-8579-broadcast-hold-bleg to master

* commit '554387c8':
  Skip holding b leg only if it is on hold

Merge pull request #1491 in FS/freeswitch from ~HUNYI/freeswitch:feature/FS-8900-improve-record_follow_transfer to master

* commit '069da397':
  Improve recording transfer

Merge pull request #1453 in FS/freeswitch from ~HUNYI/freeswitch:bugfix/FS-10826-fix-sample-rate to master

* commit '87d4a6a0':
  FS-10826 [core] Fix file handler sample rate after transfer

Merge pull request #1526 in FS/freeswitch from ~HUNYI/freeswitch:bugfix/FS-11176-fix-do-not-restore-previous-codec to master

* commit '227a1349':
  FS-11176: [core] do not use previous codec if its not ready

FS-11363 Fix unpredictable/random zoom, when camera's video aspect ratio (a/r) equal to conference layout's tile a/r

This reverts commit 0342762f.

Usually tiles recalculated when new image comes in, however when 'overlap' option is in effect - tiles recalculated multiple times.
And when layout also has 'zoom' option - when image recalculated it each round zooms itself deeper and deeper, until new images comes and image resets to proper state.
This looks like flicker.

The fix is to always take for zoom calculations real image dimensions instead of previously recalculated.

HOWEVER!
There are too many math and corner cases in mod_conference, so i propose it to be reviewed by widest audience of people who wrote mod_conference!