[Shotwell] Shotwell 0.29.1

[Jens Georg <mail jensge org>]

A new unstable release of Shotwell!

Notable changes:
 * GIF support
 * Meson-only build system
 * GTK+-3 requirement bumped to 3.22

Due to the GTK+ requirement update, this series will not be available
on Ubuntu 16.04 in the PPA.

Other changes since 0.28.0:

  * Fix an issue with undefined symbols with certain compilers
  * Remove autotools supports
  * Add GIF support (read-only, animations not supported)
  * Bump GTK requirement to 3.22 and remove deprecated function calls
  * Change some internal drawing to use GTK+ API instead of using Cairo
directly
  * Add import rolls
  * Minor visual improvements
  * Dead code and asset removal

Bugs fixed in this release:
 - https://bugzilla.gnome.org/show_bug.cgi?id=716284
 - https://bugzilla.gnome.org/show_bug.cgi?id=717833
 - https://bugzilla.gnome.org/show_bug.cgi?id=718742
 - https://bugzilla.gnome.org/show_bug.cgi?id=772339
 - https://bugzilla.gnome.org/show_bug.cgi?id=783268
 - https://bugzilla.gnome.org/show_bug.cgi?id=794293
 - https://bugzilla.gnome.org/show_bug.cgi?id=794456
 - https://bugzilla.gnome.org/show_bug.cgi?id=794673

All contributors to this release:
 - Jens Georg <mail jensge org>
 - Piotr Drąg <piotrdrag gmail com>
 - Jens Georg <mail+gitkraken jensge org>
 - gogo <trebelnik2 gmail com>
 - Rūdolfs Mazurs <rudolfsm src gnome org>
 - Marek Černocký <marek manet cz>
 - Josef Andersson <l10nl18nsweja gmail com>
 - Boyuan Yang <073plan gmail com>
 - Alan Mortensen <alanmortensen am gmail com>

Added/updated translations
 - cs, courtesy of Marek Černocký
 - da, courtesy of Alan Mortensen
 - hr, courtesy of gogo
 - lv, courtesy of Rūdolfs Mazurs
 - pl, courtesy of Piotr Drąg
 - sv, courtesy of Josef Andersson
 - zh_CN, courtesy of Boyuan Yang

Shotwell 0.29.1 is available for download at

https://download.gnome.org/sources/shotwell/0.29/shotwell-0.29.1.tar.xz