3.2.3 (stable):

Build:
* libxml++config.h.*: Don't dllimport on MinGW
  (Chun-wei Fan) Issue gtkmm#90 (Lukas K.)
* Meson build: Make it possible to use libxml++ as a subproject
  (Kjell Ahlstedt)
* Meson build: No implicit_include_directories
  (Kjell Ahlstedt)
* MSVC build: Export classes selectively
  (Chun-wei Fan)

Documentation:
* Let links point to libxml++-3.0 versions instead of latest versions
  (Kjell Ahlstedt)