Appveyor: show output also for normal unit tests

Fix Terminal.show preserveFocus parameter

Fixes #11276
Fixes #11214

Fixes #11325

Fix terminal exception when create new is called on uninitialized panel

We're sticking with simple for now, an overload can be used if a config object
is necessary later.

This reverts commit 873b3d0b.

Fixes #11377

Fix typo in doc

build with node 6 to workaround VS 2015 update 3 issue