[Android] Get write storage access on Oreo

[Geoffrey Métais]

vlc-android | branch: 2.5.x | Geoffrey Métais <geoffrey.metais at gmail.com> | Tue Jan 23 15:50:59 2018 +0100| [f52fadfa8343988d29dd7b9d46ea45400fd75c8f] | committer: Geoffrey Métais

Get write storage access on Oreo

(cherry picked from commit 0b7880a4257b08c4c5a0b1a94d9762354705c850)

> https://code.videolan.org/videolan/vlc-android/commit/f52fadfa8343988d29dd7b9d46ea45400fd75c8f
---

 .../src/org/videolan/vlc/gui/ContentActivity.java  |  6 ++
 .../vlc/gui/audio/AudioBrowserFragment.java        | 22 ++++---
 .../vlc/gui/browser/MediaBrowserFragment.java      | 21 +++++--
 .../gui/helpers/hf/StoragePermissionsDelegate.java | 44 +++++++++-----
 .../videolan/vlc/gui/video/VideoGridFragment.java  |  9 ++-
 .../src/org/videolan/vlc/util/Permissions.java     | 71 +++++++++++++---------
 6 files changed, 111 insertions(+), 62 deletions(-)

Diff:   https://code.videolan.org/videolan/vlc-android/commit/f52fadfa8343988d29dd7b9d46ea45400fd75c8f