Add support for panoramic media

[naveensingh]

Checklist

• I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• I have read the FAQ and my problem isn't listed.
• I have taken the time to fill in all the required details. I understand that the feature request will be dismissed otherwise.
• This issue contains only one feature request.
• I have read and understood the contribution guidelines.

Is your feature request related to a problem? Please describe.
The app previously used proprietary libs for panorama support. The libraries were removed as a result of #36 thus the app no longer supports displaying panoramic media.

Describe the solution you'd like
Add support for panoramic and 360° media.

Describe alternatives you've considered
None.

Additional context
https://github.com/hannesa2/panoramaGL
https://github.com/googlevr/cardboard

[ThreeDeeJay]

There's also whatever Aves is using. It seems a bit choppy compared to Simple Gallery's viewer and I don't see VR mode, though.