[FEATURE] HLS don't start with or give access to know which subtitle is the default

[siloebb]

Is your feature request related to a problem? Please describe.
When I use HLS (eg. m3u8) I receive an attribute when a subtitle is the default the DEFAULT=YES, but I can't access this field from the lib and the player don't start with the subtitle with this field marked.

Describe the solution you'd like
I wait that the video start with the subtitle that have the attribute DEFAULT=YES, a used pattern in the players, or at least give the information of which subtitle is the default.

Additional context
I saw another feature requested [FEATURE] Enable Default Subtitle , but my request differs because the HLS came ready to play and not is needed set the subtitles.

The example project have a video that can be used, the HLS subtitles, if you play in the most of players the default sub will be selected by default.
In the file of example you can see this line below with the field DEFAULT=YES
#EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID="subs",NAME="English",DEFAULT=YES,AUTOSELECT=YES,FORCED=NO,LANGUAGE="en",URI="subtitles_en.m3u8"

[siloebb]

I made a PR to resolve this issue, I will thanks if can review.

[jhomlala]

Added in 0.0.74. Thank you for your PR.