Merge branch '5.5'

diff --cc tsconfig.json
index cccdd4eeddf0313cdbcb9aa4f44ddc014d6b84a3,7913df1f3d17885bf63887109f976091842d1e9f..e870409cf29fd47f888ba8b0b8ff2e2935c4e016
--- 1/tsconfig.json
--- 2/tsconfig.json
+++ b/tsconfig.json
@@@ -11,7 -11,8 +11,8 @@@
      "outDir": "wcfsetup/install/files/js/",
      "lib": [
        "dom",
 -      "es2017"
+       "DOM.Iterable",
 +      "es2019"
      ],
      "strictNullChecks": true,
      "moduleResolution": "node",