Update to angular 19

[heapifyman]

Updates angular to version 19.

Also switches to new application builder, a migration that was done automatically when running ng update ... - see https://angular.dev/tools/cli/build-system-migration

I tested with zxing-scanner-demo, and successfully scanned some images for all formats that can be selected in the demo; using images from https://github.com/zxing-js/library/tree/master/src/test/resources/blackbox.

npm run test was successful.

I did not test if all the other old angular versions still work.

[werthdavid]

Much appreciated thank you! I'll take a look at it later and merge it then