* fix: require devtools-elements.js with the extension mentioned explicitly (#6079)

This is a workaround for the issue with `@ngtools/webpack@6.1.0-rc.2`, described here: https://github.com/NativeScript/nativescript-dev-webpack/issues/607#issuecomment-405209925

* release: cut the 4.1.1 release

* chore: Fix TS transpile error with 2.9 (#5906)