4.0.3 (stable):

Documentation:

• Update Visual Studio build docs
  (Chun-wei Fan) Pull request #56
• Parser docs: Add a link to parser options
  (Kjell Ahlstedt)

Meson build:

• Detect if we build from a git subtree
  (William Roy) Merge request gtkmm!72
• Don't copy files with configure_file()
  (Kjell Ahlstedt)
• Fix the evaluation of is_git_build on Windows
  (Kjell Ahlstedt) Issue gtkmm#131 (William Roy)
• Backport libxml2 CMake support from libxml++-5.0
  (Chun-wei Fan) Pull request #55
• Don't fail if warning_level=everything
  (Daniel Boles, Kjell Ahlstedt) Merge request gtkmm!87
• Don't require the 'dot' command to build the documentation
  (Kjell Ahlstedt) Issue libsigcplusplus#98
• Add the build-manual option
  (Kjell Ahlstedt)
• Add bcrypt dependency when libxml2 is a subproject
  Issue #64 (Kjell Ahlstedt)
  (Andrew Potter) Pull request #65

Build:

• Make it compatible with libxml2 >= 2.12.0
  by modifying #include directives
  (Kjell Ahlstedt)