Do not implement properties or code. It is a interface
and should be typed as one.

- Also remove extra include of settings. No longer needed.

- Composer PSR-4 autoloading.

- Reduce logic complexity.
- Return early. Code get called on every request and should be fast.
- Remove support for mirroring multiple uri. Code uses a long gone
PHP function. Split this into a private method.

- Also require the file. Force it to fail hard if not found.

Cleanup that improve code readability.

First thing application do is loading the settings making sure
that it is available.

We cannot just remove data from common.inc.php
The class expect and try to use it throwing errors/warning every
time the application load.

- No need to waste time calling Utils::uri2curie()

- Use PSR-4 autoloading
- Clean up code and reduce complexity.

- Paves way for real autoloading in the future.

- Always called utilities. We need to make sure they work
as expected. Introduce PHPUnit tests.
- Due to the use of gobals inside the static methods they
become untestable. Remove use of global but that also
forces a change if method signature.

- Always run and should be fast.
- Introduce tests to make sure I actually work.
- Stop method from using global states to make it testable and safe.

Since there is no code style lets use PSR-12
https://www.php-fig.org/psr/psr-12/

Since there is no code style lets use PSR-12
https://www.php-fig.org/psr/psr-12/

- Fix static linked ARC2 lib in module code.
- Fix typo in index.php

- PSR4 autoload all classes except modules.
- Explicit declare what is used by classes.
- Composer define what PHP modules are used.

- Remove included ARC2 lib.
- Replace static included library from /vendor. No
autoloading, yet.

- Improve readability

- Removed no longer needed inline comments.