[gtkmm-documentation] Created tag 4.0.0

[Kjell Ahlstedt <kjellahl src gnome org>]

The unsigned tag '4.0.0' was created.

Tagger: Kjell Ahlstedt <kjellahlstedt gmail com>
Date: 1608475046 +0100

    4.0.0

Changes since the last tag '3.97.1':

Chun-wei Fan (1):
      Update the "gtkmm and Win32" appendix

Kjell Ahlstedt (36):
      examples: Update for latest gtkmm4 (no Gdk::EventButton, etc.)
      examples: Update for latest gtkmm4 (remove property_margin(), etc.)
      Use glibmm-2.66 instead of glibmm-2.64
      Meson build: Set default value of the 'warnings' option to 'min'
      Keyboard events example: Update a ModifierType mask
      examples: Update for latest gtkmm4 (remove Gtk::ShadowType, etc.)
      examples/book/[ab]*: Update some examples after Gtk::Container was removed
      examples/book/[cd]*: Update some examples after Gtk::Container was removed
      examples/book/[e-n]*: Update some examples after Gtk::Container was removed
      examples/book/[o-z]*: Update some examples after Gtk::Container was removed
      examples/others/*: Update some examples after Gtk::Container was removed
      example programs: Use Glib::make_refptr_for_instance() in create()
      examples: Don't use application menus
      examples/book/buildapp: Update Makefile.am and Makefile.example
      Fix clipboard example programs
      index-in.docbook: Don't try to show removed app_menu.ui file
      The .hg and .ccg files section: Remove description of CHILD_PROPERTY
      Describe how the mm-common/skeletonmm project is built with Meson
      Update the Building applications chapter
      entry/completion example: Remove actions
      input example: Don't include build/config.h
      Describe how to build a multi-threaded program
      Remove description of Gtk::Container
      Update after Gtk::RadioButton has been removed
      Meson build: Exclude some git-tracked files from tarballs
      Meson build: Drop dependence on Perl
      Autotools build: Distribute docs/tutorial/insert_example_code.py
      Use Gtk::Application::make_window_and_run()
      Improve the builder examples
      docs/tutorial/Makefile.am: Try to adapt to Infrastructure/damned-lies
      docs/tutorial/Makefile.am: Modify for Infrastructure/damned-lies
      Remove the FileChooserButton example
      Use glibmm-2.68 instead of glibmm-2.66
      Refer to README files for building with Meson
      Change GTK+ to GTK
      4.0.0