Added VTT patch on SVC in TS 

git-svn-id: https://gpac.svn.sourceforge.net/svnroot/gpac/trunk/gpac@4376 63c20433-aa62-49bd-875c-5a186b69a8fb
removed openHEVC from win32 build until we have a win32 version of the lib

git-svn-id: https://gpac.svn.sourceforge.net/svnroot/gpac/trunk/gpac@4377 63c20433-aa62-49bd-875c-5a186b69a8fb
Merge branch 'plain'

Conflicts:
	src/isomedia/avc_ext.c
	src/media_tools/m2ts_mux.c
	src/media_tools/media_export.c
	src/media_tools/media_import.c
	src/media_tools/mpegts.c