Fix Osmo4 File->Open

git-svn-id: svn://svn.code.sf.net/p/gpac/code/trunk/gpac@4705 63c20433-aa62-49bd-875c-5a186b69a8fb
fix vtt_in.vcxproj UUID (copied from svg_in.vcxproj?)

git-svn-id: svn://svn.code.sf.net/p/gpac/code/trunk/gpac@4706 63c20433-aa62-49bd-875c-5a186b69a8fb
more robust AVCC parsing
see https://sourceforge.net/p/gpac/discussion/287546/thread/92e25b3f/

git-svn-id: svn://svn.code.sf.net/p/gpac/code/trunk/gpac@4707 63c20433-aa62-49bd-875c-5a186b69a8fb