Add support for segment play option (-G, --segment)

Play just sub-segment(s) specified by comma separated time segments.
Each time segment defined by dash separated time values of begin-end.
Playing from begin to end.

Signed-off-by: Yotam Medini <yotam.medini@gmail.com>
Signed-off-by: TAMUKI Shoichi <tamuki@linet.gr.jp>