Use fixed npm dependency versions (#365)

* Use fixed npm dependency versions

* Add package.json and package-lock.json

* Run `npm ci` for all packages in package.json

Author: atextor

.gitignore

@@ -14,8 +14,6 @@ local.properties
 .settings/
 .loadpath
 .recommenders
-package-lock.json
-package.json
 
 # External tool builders
 .externalToolBuilders/