Set TTY depending on execution context for all processes

[roborourke]

Makes sure that output is properly formatted.

[roborourke]

Here's the follow on @tfrommen!

[rmccue]

These should be set based on whether the current process is a TTY, no?

[roborourke]

The start command has had this for ages so we're bringing them in line with that #328

We only use tty detection for the exec command right now.

[rmccue]

Seems like they should consistently do so though; otherwise, something like composer server logs php | tee some.log | tail -f will likely break.

[roborourke]

Using $process->setPty( true ) (pseudo terminal) works, Symfony figures out whether the output is being piped to something else or not.

[tfrommen]

Colors! 😍

[rmccue]

I am thinking more like $process->setTty( posix_isatty( STDOUT ) ); passing the code through. Setting pty won't pass through interactive prompts if those would have occurred (iirc)