[gtkmm/gtkmm-3maybe] (19 commits) ...Remove more deprecated methods.

[Murray Cumming <murrayc src gnome org>]

Summary of changes:

  a0d3be0... Add CellRendererSpin and Spinner. (*)
  b5949a6... Marked the branch in the ChangeLog (*)
  ba4e854... Added Dialog::get_widget_for_response(). (*)
  bf32826... Gdk::PixbufAnimationIter: Make the methods public. (*)
  f63da14... Gdk::Window: Add get/set_offscreen_embedder() and get_offsc (*)
  f040fa1... 	Make build successful when exceptions, vfuncs, etc. are di (*)
  5083e44... 	Gtk::Builder: Correct tab typos. (*)
  c906ef7... Fix warnings. (*)
  2f9d3a3... Add missing files to installer, warn about paths containing (*)
  fb5a5cb... Added ToolPalette. (*)
  e4305d7... Make getting Gtk::Border style properties work. (*)
  9f99b98... ToolPalette: Added drag methods. (*)
  449e588... Added and used ToolItemGroup. (*)
  5b86f5c... Gdk::Window::get_default_root_window(): Correct the referen (*)
  42b550d... Correct the ChangeLog (*)
  8d50e8a... Fix the build with new GTK+ deprecations, when using fatal  (*)
  234f684... 2.19.2 (*)
  ba104af... Fixed merge
  32897f8... Remove more deprecated methods.

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