Combine the Node console reporters, update reporter config

[jason0x43]

Combine Runner, and Pretty into a single NodeConsole reporter, and drop Simple. The combined reporter should use Runner's output format by default (streaming text to the console), but should support Pretty's multi-session output format (erase screen, draw multiple progress bars) as an option. This reporter should always be loaded, and will not be dealt with by name; it is simply Intern's output.

Add a new "output" top-level config option to manage Intern's default output. It should have at least the following options:

{
  "output": {
    "disabled": true,      // false by default, disables the default reporter entirely
    "fullScreen": false,   // false by default, enables full screen mode for showing concurrent test sessions
    "hideSkipped": false,  // boolean or a string, like current Runner option
    "hidePassed": true,    // boolean or a string, like current Runner option
  }
}

See discussion in #1023.

[jason0x43]

The config updates are related to #1109.