[Android] Improve empty view design

[Nicolas Pomepuy]

vlc-android | branch: 3.2.x | Nicolas Pomepuy <nicolas.pomepuy at gmail.com> | Wed Sep 18 16:00:57 2019 +0200| [ef66bc0f6f0d550b8a26089a757ea8e114d6ad98] | committer: Geoffrey Métais

Improve empty view design

(cherry picked from commit 19da32d8c233a5bf4ff430ea155ae63b25866c95)

> https://code.videolan.org/videolan/vlc-android/commit/ef66bc0f6f0d550b8a26089a757ea8e114d6ad98
---

 assets/images/svg/ic_empty.svg              |  34 ++++
 vlc-android/res/drawable/ic_empty.xml       |  35 +++++
 vlc-android/res/layout/audio_browser.xml    | 112 +++++++-------
 vlc-android/res/layout/folders_fragment.xml |  90 +++++------
 vlc-android/res/layout/song_browser.xml     |   4 +-
 vlc-android/res/layout/video_grid.xml       | 230 ++++++++++++++--------------
 vlc-android/res/values/styles.xml           |   1 +
 7 files changed, 293 insertions(+), 213 deletions(-)

Diff:   https://code.videolan.org/videolan/vlc-android/commit/ef66bc0f6f0d550b8a26089a757ea8e114d6ad98