[gtk] (17 commits) ...Merge branch 'matthiasc/for-master' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  2d766df... NEWS: Updates (*)
  b7d4250... docs: Some touchups to the migration guide (*)
  5a7faa6... docs: Add new check button apis (*)
  5ab77e7... docs: Misc updates (*)
  93d9a2c... colorchooser: Bring back gtk_color_chooser_widget_new (*)
  2b5b6e0... Drop gtk_render_slider from headers (*)
  aa5207b... iconview: Small doc additions (*)
  ff9ca2b... Clean up debug flags code a bit (*)
  d2faa38... Move version-related functions to gtkversion.c (*)
  fedeb51... Drop support for GTK_TEST_TOUCHSCREEN (*)
  4b589b6... main: Reshuffle debug code (*)
  b166999... Add gdk_frame_clock_get_fps (*)
  c462f35... inspector: Use gdk_frame_clock_get_fps (*)
  c66a8cb... gtk-demo: Use gdk_frame_clock_get_fps (*)
  3b11896... gtk-demo: Impove the fishbowl demo (*)
  9f03462... gtk-demo: Improve the scrolling demo (*)
  d45aabb... Merge branch 'matthiasc/for-master' into 'master'

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