[gexiv2] (19 commits) Non-fast-forward update to branch wip/58

[Jens Georg <jensgeorg src gnome org>]

The branch 'wip/58' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  d284d3a... wip: Fix ordering of XMP tags

Commits added to the branch:

  448798c... Remove an unused variable (*)
  34a1612... all: Properly mark overriden methods (*)
  1aa6f39... Minor compiler warnings fixes (*)
  d92d7ff... win32: Provide UTF16 filename for exiv2 (*)
  6bebb0e... win32: Handle non-unicode exiv2 case (*)
  723dd01... win32: Convert paths for saving (*)
  c12fb87... Purge duplicates from gexiv2_metadata_get_iptc_tags() retur (*)
  7c96177... - Replaced NULL with nullptr - Updated 'for' loop with auto (*)
  3b09fd6... Add Exif support to gexiv2_metadata_*_tag_multiple() (*)
  2d9f212... Replaced NULL with nullptr (*)
  cdac1c7... Issue #60: alt gexiv2_metadata_try_(g|s)et_tag_multiple() w (*)
  2642578... New gexiv2_metadata_try_(g|s)et_tag_string() variants with  (*)
  89c92dc... gexiv2: properly deprecate functions in favor of gexiv2_met (*)
  76be56d... Add missing error to exif_*_multiple (*)
  d6ae27f... Fix order of specifiers in GioIo - read() (*)
  d1bd551... doc: Various fixes (*)
  d04a337... doc: Remove Yorba from README (*)
  6dd086a... Add missing nullptr checks for error (*)
  41ed229... Fix ordering of XMP tags

(*) This commit already existed in another branch; no separate mail sent