Road to version 2 - Refactor and rewrite most of the library

Created by: drupol

This PR

• This will be the future version of cas-lib (version 2)
• Break backward compatibility
• Make sure that the CAS service is stateless by avoiding injecting the $request in the CAS constructor, also make sure that the Request is passed to each relevant method instead of being injected in the constructor.
• Make it PSR15 compatible
• Simplify configuration, get rid of allowed_parameters property.
• Merge handlers, services and redirect classes.
• Remove the dependency to monolog/monolog and throw exceptions when needed.
• Remove Introspector, use Response decorator and factories
• Now depends on loophp/psr17
• Has more and updated tests

Related to https://github.com/ecphp/cas-bundle/issues/63 and https://github.com/ecphp/cas-bundle/pull/59 Related to https://github.com/ecphp/ecas/pull/27 Related to https://github.com/ecphp/eu-login-bundle/pull/40

docs/pages/configuration.rst

@@ -7,36 +7,21 @@ Configuration
    protocol:
      login:
        path: /login
-       allowed_parameters:
-         - service
-         - renew
-         - gateway
+       default_parameters:
+         foo: bar
      serviceValidate:
        path: /p3/serviceValidate
-       allowed_parameters:
-         - service
-         - ticket
-         - pgtUrl
-         - renew
-         - format
        default_parameters:
          pgtUrl: https://my-app/casProxyCallback
      logout:
        path: /logout
-       allowed_parameters:
-         - service
        default_parameters:
          service: https://my-app/homepage
      proxy:
        path: /proxy
-       allowed_parameters:
-         - targetService
-         - pgt
+       default_parameters:
+         foo: bar
      proxyValidate:
        path: /proxyValidate
-       allowed_parameters:
-         - service
-         - ticket
-         - pgtUrl
        default_parameters:
-         pgtUrl: https://my-app/casProxyCallback
\ No newline at end of file
+         pgtUrl: https://my-app/casProxyCallback