Windows 10 console seems to now provide ANSI support without ANSICON.

`\Symfony\Component\Console\Output\StreamOutput::hasColorSupport()` will probably need updating as Windows 10 ConHost+CMD now seems to provide ANSI support without the need to use ANSICON.

Whilst doing that is/should be easy enough, I don't know how to get the terminal dimensions for `\Symfony\Component\Console\Application::getTerminalDimensions`.
