Fix command-line arguments & allow using env vars and wildcard IP addresses for server

[Pierstoval]

Using PHP 7.2.2 on Windows, testing this code in the WebServerManager:

$commandLine = [$binary] + $finder->findArguments() + ['-dvariables_order=EGPCS', '-S', \sprintf('%s:%d', $this->hostname, $this->port)];

$commandLine2 = array_merge([$binary], $finder->findArguments(), ['-dvariables_order=EGPCS', '-S', \sprintf('%s:%d', $this->hostname, $this->port)]);

dump($commandLine);
dump($commandLine2);

And I have this output:

array:3 [
  0 => "E:\dev\php72-nts\php.exe"
  1 => "-S"
  2 => "0.0.0.0:12000"
]
array:4 [
  0 => "E:\dev\php72-nts\php.exe"
  1 => "-dvariables_order=EGPCS"
  2 => "-S"
  3 => "0.0.0.0:12000"
]

The first one is wrong, so I decided to refactor it with a plain array_merge() that will surely be working 👍

This PR also introduces lots of other changes that allow using env vars and ips like 0.0.0.0 for servers listening to any host. I thought it would be a really nice improvement

[dunglas]

Can you provide the bug fix in a separate PR please?

[dunglas]

Why this change? It will not work if the / route isn't defined for instance.

[Pierstoval]

Because it instead uses a socket, I thought it might be a much better idea

[dunglas]

I'm 👎 to use a socket. Using a HTTP client ensure that this a HTTP server. (A server supporting another protocol may already use this port).

[dunglas]

Please use yoda style.

[dunglas]

\count()

[Pierstoval]

As #28 is merged, the bugfix part is OK.

For the rest, we discussed with @dunglas on Slack and for now the socket part is not something we really need.

Let's close 😄