Revert "Api v4"

Dockerfile

DockerfileDebug

api/Readme.md

api/TODO.md

api/api.php

api/apilib.php

api/config.php.dist

api/config.php.docker

api/endpoint.html

api/endpoint.php

api/install.php

api/libs/defaults/main.yaml

api/libs/export.php

api/libs/input_values.php

api/libs/tools.php

api/libs/validate.php

api/libs/yaml.php

api/libs/yaml_defaults.php

api/minimal.php

api/tests/README.md