Replace static make() factory methods with constructor calls:

• FullyQualifiedNameTest: new FullyQualifiedName() instead of ::make()
• MethodTest: new Method() instead of ::make()

nothing to see here :o)

• setup Github Actions
• changed tooling from scripts to Makefile
• installed phpstan as a dev dependency
• installed swiss-knife as a dev dependency
• installed rector as a dev dependency
• added PHP CS Fixer configuration
• dockerized for local development

• dropped support for PHP < 7.2
• added support for PHP 8

• Renamed Object references to Objeckt (Thanks Maciej Kobus)

• added return type hints

Dropped support for PHP < 7.

This means we now can use:

• scalar type hints
• return type hints
• callable type hint, without having to check PHP version

All make static constructor were created for PHP < 5.6, they're
now deprecated. Here's an example of what to use instead:

(new Method('sayHello'))
    ->addArgument(new Argument('string', 'name')))
;

BC breaks:

• changed maximum method argument line length from 120 to 80
• changed opening curly brace to be on the same line as the method closing
  parenthesis, when arguments are on many lines
• changed properties to not have empty lines between them,
  except if they have PHPdoc

• added support for PHP 7

• added abstract class generation
• added return PHPdoc tag generation
• added throws PHPdoc tag generation