[gtk] (8 commits) Non-fast-forward update to branch gamma-shenanigans

[Matthias Clasen <matthiasc src gnome org>]

The branch 'gamma-shenanigans' 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:

  73cafa1... Support 16-bit floating point textures
  fff033e... Support 32-bit floating point textures
  f94a95a... Add gdk_texture_save_to_file
  93ed4d4... Support loading and saving float textures
  e21ac7f... Redo the conversion setup for memory formats
  d238f69... Allow conversion to hdr formats
  140cae7... Add gdk_texture_download_float
  e63b8d0... Switch to downloading GdkRGBA

Commits added to the branch:

  f71e335... Support 16-bit floating point textures
  eda2239... Support 32-bit floating point textures
  f7573a3... Add gdk_texture_save_to_file
  992b6dc... Support loading and saving float textures
  9976b34... Redo the conversion setup for memory formats
  b21c9a4... Allow conversion to hdr formats
  3f835e2... Add gdk_texture_download_float
  39db04e... Switch to downloading GdkRGBA