Symfony's new directory structure and the settings.

[Coffee2CodeNL]

What are the proper settings for the new directory structure?

Translations is now translations, easy.
Web directory is now public, easy.
App directory is now what exactly? this one is a bit hard to change to the right folder....

[Haehnchen]

related #1118, #1147

[Aerendir]

App directory is the whole src directory.

Basically the previous app directory now doesn't exist anymore and all is moved to src (due to the removing of support for bundles - only the ones that are not reusable).

[cybernet]

#1118 is still not fixed, it's been months since symfony 4 was released and now it is stable ( 4.1.1 ), yet this is still a bug :)

[tom10271]

Service id resolving is still not working. I have cleared PHPStorm's cache and restarted IDE already

[Haehnchen]

duplicate, see related issues: #1736

ui will be changed; but there is already a lot of guessing the value independent from settings