[gtk] (17 commits) Non-fast-forward update to branch wip/otte/memoryformat

[Benjamin Otte <otte src gnome org>]

The branch 'wip/otte/memoryformat' 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:

  0bf38eb... texture: Refactor downloading
  8238e36... png: Do loader conversions in GDK
  556699f... Add private memory formats used by libpng
  20f8582... png: Refactor png saving
  0400359... gl: Fix downloading textures *again*

Commits added to the branch:

  144f727... Rename ngl to gl (*)
  7a1644b... Maintain abi (*)
  f868c67... Skip gsk_ngl type funcs (*)
  b7eb1d3... gsk: provide an ngl renderer (*)
  0054f8b... docs: Mention gtk_window_set_position() being gone (*)
  c7bb4a9... docs: Add GdkPixbuf to the URL map (*)
  cfadca6... [gtkimcontextquartz] Accommodate moving GdkSurface widget t (*)
  232003b... Merge branch 'docs-urlmap' into 'master' (*)
  922e6ad... Merge branch 'docs-window-position' into 'master' (*)
  49a64da... Merge branch 'ngl-is-the-new-gl' into 'master' (*)
  f40ce51... x11: Don't try to move destroyed windows (*)
  d89e82d... Merge branch 'wip/otte/for-master' into 'master' (*)
  b65b646... texture: Refactor downloading
  7b41738... png: Do loader conversions in GDK
  50390bf... Add private memory formats used by libpng
  26b9a37... png: Refactor png saving
  6d2f0a4... gl: Fix downloading textures *again*

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