add support for live url

[invisiblecoder99]

request for live mpd calculation. so can fetch live streaming content. also implement audio timelines for number template

[ForceGT]

Can I send a PR?
for live url support

[xbstory]

Can I send a PR?
for live url support

of course

[ForceGT]

See #5
Please let me know if any changes needed
Thanks