Support network folder in MediaLibrary

This requires

• checking for ML support
• UI support in the right click menu
• a way to disable the items

added Feature label

added 1 deleted label

changed milestone to %3.4.0

Somewhat partly related MR: !553 (closed)

Though this MR doesn't cover it all.

added Network label

marked this issue as related to #503 (closed)

changed milestone to %3.5.0

assigned to @Perklone

@jbk what does "a way to disable the items" mean?

Duh. No clue.

We need to be able to add a folder into the MediaLibrary.

And we need to be sure if, when the share is unreachable, the item is marked as disabled, and not deleted from the ML. Maybe that?

Is it possible to blacklist a network shared folder? Like android is doing for the system to "disable them"

changed milestone to %4.0.0

unassigned @Perklone