Issue #2493807 by jhedstrom, cilefen: Add symfony/console component to core

core/composer.json

core/composer.lock

core/vendor/composer/autoload_namespaces.php

core/vendor/composer/installed.json

...symfony/console/Symfony/Component/Console/Application.php

...or/symfony/console/Symfony/Component/Console/CHANGELOG.md

...ony/console/Symfony/Component/Console/Command/Command.php

...console/Symfony/Component/Console/Command/HelpCommand.php

...console/Symfony/Component/Console/Command/ListCommand.php

...mfony/console/Symfony/Component/Console/ConsoleEvents.php

...y/Component/Console/Descriptor/ApplicationDescription.php

...nsole/Symfony/Component/Console/Descriptor/Descriptor.php

...fony/Component/Console/Descriptor/DescriptorInterface.php

...e/Symfony/Component/Console/Descriptor/JsonDescriptor.php

...mfony/Component/Console/Descriptor/MarkdownDescriptor.php

...e/Symfony/Component/Console/Descriptor/TextDescriptor.php

...le/Symfony/Component/Console/Descriptor/XmlDescriptor.php

...e/Symfony/Component/Console/Event/ConsoleCommandEvent.php

.../console/Symfony/Component/Console/Event/ConsoleEvent.php

...Symfony/Component/Console/Event/ConsoleExceptionEvent.php