[gtk] (8 commits) Non-fast-forward update to branch wip/otte/color-profiles

[Benjamin Otte <otte src gnome org>]

The branch 'wip/otte/color-profiles' 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:

  d69c563... png: Do loader conversions in GDK
  a3b9044... png: Add private formats for weird PNG stuff
  891e7fc... memoryformat: Optimize more
  0c7799a... colorprofile: Implement a global transform cache
  ed00473... FIXME: Add crude color management impl for cairo
  34800ce... FIXME: Add a crude way to color-correct GdkRGBAs

Commits added to the branch:

  56929cd... png: Do loader conversions in GDK
  1c93def... png: Add private formats for weird PNG stuff
  944b743... memoryformat: Optimize more
  a3e77e0... colorprofile: Implement a global transform cache
  a24a37e... png: Handle color profiles
  b3260f6... png: Refactor png saving
  cf39750... FIXME: Add crude color management impl for cairo
  e0e0c6d... FIXME: Add a crude way to color-correct GdkRGBAs