[Android] Allow sorting in the album screen

[Nicolas Pomepuy]

vlc-android | branch: master | Nicolas Pomepuy <nicolas at videolabs.io> | Tue Mar  3 16:57:28 2020 +0100| [bb15facf00bcb809208b4b67b88430b3fbd6e56c] | committer: Geoffrey Métais

Allow sorting in the album screen

Fixes #1169

> https://code.videolan.org/videolan/vlc-android/commit/bb15facf00bcb809208b4b67b88430b3fbd6e56c
---

 .../resources/src/main/res/values/strings.xml      |  1 +
 .../vlc-android/res/menu/playlist_option.xml       | 71 ++++++++++++++++++++++
 .../src/org/videolan/vlc/gui/PlaylistActivity.kt   | 49 +++++++++++++++
 .../providers/medialibrary/MedialibraryProvider.kt |  3 +-
 .../vlc/providers/medialibrary/TracksProvider.kt   | 17 +++---
 .../src/org/videolan/vlc/util/ModelsHelper.kt      | 19 +++---
 6 files changed, 141 insertions(+), 19 deletions(-)

Diff:   https://code.videolan.org/videolan/vlc-android/commit/bb15facf00bcb809208b4b67b88430b3fbd6e56c