Script that automatically creates all.hpp files

[smehringer]

Description

In each (subfolder) we want to have an all.hpp file for the user, s.t. the user can include the whole (sub)module.

An all.hpp file contains all public API files (no detail files) in it's directory plus all all.hpp files of it's subdirectories.

The all.hpp files need to be up to date but are often forgot to adapt when moving files around or adding new ones. Thus they should be created automatically.

Tasks

• Create a script (bash or pearl) that automatically creates all.hpp files (If too tricky to avoid, detail files can be included for now. including all.hpp files is inefficient concering compile times anyway)

Definition of Done

• Implementation and design approved
• Unit tests pass

[smehringer]

Fixed by seqan/seqan3#2841