[gtkmm] (13 commits) Non-fast-forward update to branch win32-installer-update-3

[Chun-wei Fan <fanchunwei src gnome org>]

The branch 'win32-installer-update-3' 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:

  b8af4bd... gtkmm-installer.nsi.in: Update for gtkmm-3.x
  dc2c053... win32_installer: Re-organize the MSVS property sheets

Commits added to the branch:

  3729e5b... docs/reference/Doxyfile.in: Remove obsolete entry (*)
  35716e6... build: Support Visual Studio 2022 (*)
  f440159... treeiter.hg: Declare TreeValueProxy copy constructor =defau (*)
  032b61b... meson.build: Specify 'check' option in run_command() (*)
  d35fab2... meson.build: Check if Perl is required for building documen (*)
  acdca16... Gtk::Object::_release_c_instance(): Unref orphan managed wi (*)
  dfb6429... 3.24.6 (*)
  9e12298... gtkmm-installer.nsi.in: Update for gtkmm-3.x
  20f498d... win32_installer: Re-organize the MSVS property sheets
  a3aef55... meson.build: Dist the win32_installer directory
  53c4955... meson: Copy COPYING to win32_installer/meson
  82fb51c... WIP: Add nmake makefile to build installer
  2fef4ec... gtkmm-installer.nsi.in: Disable translations for now

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