FS-10465: [mod_v8] Fix javascript failures when a session callback is called from another thread/leg.

FS-10167: Significant cleanup and isolation of code into manager types for better maintainability and easier path to future updates

Merge pull request #1323 in FS/freeswitch from ~ANDYWOLK/freeswitch:bugfix/FS-10464-fix-broken-classes-after-switching to master

* commit 'cd79ae19':
  FS-10464 [mod_v8] Fix broken classes after switching to new libv8 #resolve

FS-10458: [mod_av] temporarily silence warning when building against ffmpeg 3.2 until we fix them properly

FS-10457: [mod_cdr_csv] set group too when creating new csv file so other users in the group can access it

FS-10456: [mod_av] add wav support to mod_av as well as specifying audio_codec -- add av_record_audio_only param

* commit '4631e6cd':
  FS-10453 [kazoo] fix dropped messages

* commit 'fb46f87b':
  FS-9785: fix ./mod_conference.h:353:23: error: enumerator value for ‘EFLAG_BLIND_MEMBER’ is not an integer constant expression [-Werror=pedantic] EFLAG_BLIND_MEMBER = (1 << 31)
  FS-9785: update mod_event_multicast to work with OpenSSL 1.1.0.
  FS-9785: Fix src/switch_ivr_play_say.c:1668:48: error: ‘*’ in boolean context, suggest ‘&&’ instead [-Werror=int-in-bool-context]
  FS-9785: Fix format-truncation warnings for systems that treat it as an error.

FS-9785: fix ./mod_conference.h:353:23: error: enumerator value for ‘EFLAG_BLIND_MEMBER’ is not an integer constant expression [-Werror=pedantic] EFLAG_BLIND_MEMBER = (1 << 31)

FS-9785: Fix src/switch_ivr_play_say.c:1668:48: error: ‘*’ in boolean context, suggest ‘&&’ instead [-Werror=int-in-bool-context]

FS-10433: [mod_av,mod_conference] Crash when video recording fails to setup properly -- fix regression

Merge pull request #1318 in FS/freeswitch from ~ANDYWOLK/freeswitch:feature/FS-10436-upgrade-javascript-libv8-from-3.24.14 to master

* commit '4455893e':
  FS-10436 [mod_v8] Upgrade javascript libv8 from 3.24.14 to 5.6.326 on windows.

Merge pull request #1317 in FS/freeswitch from ~ANDYWOLK/freeswitch:feature/FS-10435-update-mod_v8-to-support-future to master

* commit 'ba32e0e2':
  FS-10435 [mod_v8] Update mod_v8 to support future v8 engine version change

FS-10249: [mod_av] Audio gradually falls behind video in recordings -- init timer for audio only as well