Sort extensions by name

[PKuhlmay]

At the moment, the extensions are not sorted inside the list after clicking "open".

They should be sorted for a better readability.

Inside

extension_builder/Classes/Controller/BuilderModuleController.php

Line 537 in db6794d

$extensions = $this->extensionRepository->findAll();

they could be sorted by name.

[DavidBruchmann]

#762 should be deleted it goes on the wrong branch. I didn't find an option to delete it by myself.
#763 has to be cherrypicked perhaps as I did an offered merge that fails the tests.

[PKuhlmay]

Fixed by #763