Merge branch 'gitlab-ci-windows' into 'master'

Windows builds in the Gitlab CI/CD pipeline

See merge request graphviz/graphviz!1438

diff --cc CHANGELOG.md
index 379ab5fdd5298776f93558a7e61844649bf2c93a,f8cafd0977dc2133611f9bd7b63d8f60afeaf278..2c66c4335f6b5f0b9481f895db34a1d925aca53f
--- 1/CHANGELOG.md
--- 2/CHANGELOG.md
+++ b/CHANGELOG.md
@@@ -12,8 -12,12 +12,13 @@@ and this project adheres to [Semantic V
    - graphviz-2.42.2-dotty-menu-fix.patch
    - graphviz-2.42.2-ocaml-allow-const-cast.patch
  - some allocation failures that could previously allow memory corruption now exit
 +- lab_gamut.3.pdf is no longer included in release archives
  
+ ### Changed
+ - Windows binaries available at https://www2.graphviz.org/Packages/ instead of
+   https://ci.appveyor.com/project/ellson/graphviz-pl238
+ - Retarget Windows builds to Visual Studio 2019 and toolset v142
+ 
  ### Fixed
  - Released Ubuntu packages does not contain language bindings for Python3 #1737
  - Neato's hier mode is broken since v2.44.0 #1726

diff --cc lib/ast/ast.vcxproj
Simple merge

diff --cc lib/edgepaint/lab.c
Simple merge