add minimal windows support

[dmanto]

This should fix all pending claims from your review. Rebased from new master branch (PR#1 was based on windows branch, that's why I closed it and created this new one).

• Added function listenAddress() to allow portable server start (string with either 'http://*?fd=3' or 'http://
  :'.
• Added env variable MOJO_SERVER_STARTER_AVOID_FDPASS to avoid fd pass of listening socket when it is not supported by the server. (for example, does Dancer support listening to fd=3 ?. Didn't find how to). Python / RoR / PHP platforms probably have other ways, not sure about that.
• Modified README to document new functionalities.
• Modified test/support/server.js to support portable url, plus delayed start to mock slow server.
• Changed github CI action strategy to test MOJO_SERVER_STARTER_AVOID_FDPASS 0 and 1 cases.
• Added ECONNREFUSED test for server slower than connectTimeout mS

Related to issue #1

[kraih]

Opening a second PR feels like you're dismissing all my previous reviews. I've tried very hard to tell you exactly what i expect from this feature. And you still do the opposite intentionally (as illustrated by comments). I don't think both of us want the same from this module, so perhaps you would be better off just releasing your own Windows specific one instead.

[kraih]

Normally i would flag this PR as work in progress and wait for your response/changes, but since you close those anyway i'll do the same now.