2.12.0 (stable)

• Add track_object(), deprecate track_obj()
  (Kjell Ahlstedt) Issue #78 (LordVolumeForm)

Examples, tests:

• examples/member_method: Make on_print() non-virtual
  (Kjell Ahlstedt)
• test_limit_reference.cc: Don't use auto where a slot is required
  (Kjell Ahlstedt) Issue #44 (Murray Cumming)

Build:

• Meson: Avoid configuration warnings
  (Kjell Ahlstedt)
• Meson, MSVC: Compensate for the lack of msvc_recommended_pragmas.h
  (Chun-wei Fan)
• Fix build with -Dbuild-deprecated-api=false
  (Kjell Ahlstedt) Issue #82 (bbhtt)
• Meson: Detect if we build from a git subtree
  (William Roy) Merge request gtkmm!72
• Meson: Simplify lookup of python command
  (wael444) Pull request #83
• Meson: Add build_tests option
  (Fabrice Fontaine) Pull request #84