FS-9704: [mod_av] Seeking video files with mod_av after it reaches the end does not work fix regression

FS-10088: [freeswitch-core] Backports backport video modification functions to fix a seg in conference caused by backporting FS-10107

FS-10091: [mod_conference] Conference play file with full-screen=true has side effect on member video

FS-10118: [freeswitch-core] Race conditions from lack of error checking in switch_core_session_read_lock #resolve

Conflicts:
	src/switch_core_media.c

Conflicts:
	src/switch_core_media.c

FS-10091: [mod_conference] Conference play file with full-screen=true has side effect on member video

FS-10079: [mod_conference] Possible lockup when sending many commands to conference at once #resolve

Conflicts:
	src/mod/applications/mod_conference/conference_video.c

FS-10067: [mod_sofia] add update-refresher profile param and sip_update_refresher channel var to use update for session timers

Conflicts:
	src/mod/endpoints/mod_sofia/mod_sofia.h

FS-10058: [mod_voicemail] voicemail timestamp plays in military time

FS-10041: [mod_conference,mod_sofia] Invalid contact,<(null)>;isfocus, when hold call inside a conference room #resolve

Conflicts:
	src/mod/endpoints/mod_sofia/mod_sofia.c

Conflicts:
	src/switch_core.c

FS-10091: [mod_conference] Conference play file with full-screen=true has side effect on member video #resolve

modcheck.sh gets called by build/Makefile when doing "make install" with
parameter "$(modulesdir)". This is fine when the install is done on a
live system. But when "make install" was called with a "$DESTDIR" then
this won't work, as the correct path would then be
"$(DESTDIR)$(modulesdir)". So add "$(DESTDIR)" in front.
Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>