Update changes

Signed-off-by: Chen Wang <wangvsa@gmail.com>

Update reader code to make it compatible with older traces

Signed-off-by: Chen Wang <wangvsa@gmail.com>

replace some malloc with recorder_malloc

Signed-off-by: Chen Wang <wangvsa@gmail.com>

Update overview doc

Update README and version in cmake file

Update README.md

Update README.md

Update README.md

Support F_DUPFD_CLOEXEC for fcntl()

Update version to 2.2.0