Add feature for offline support

[raelgc]

While using Google Photos in mobile, a cool feature is that we can use it to replace default photo gallery, as it works offline.

A new row in the features table should be added for this support.

[meichthys]

This sounds like a good feature to add, however it is really only relevant for projects that support android since all desktop apps are local by default and iOS does not allow changing the gallery.

It may be necessary to have sub-features for mobile so we could have a tree like:

• Mobile
  • Android
    • feature
  • iOS
    • feature
      ...etc..

This would become a bit difficult to display if some features exist for both android and iOS. At this point it may be better to store the data in a database and create different 'views', but this grows in complexity quickly.

[raelgc]

@meichthys Basically the feature is "offline" support (replace the gallery is just a side effect).

[meichthys]

Ok, yes, that would be much easier 👍