Allow the Nudge window to be moved by the end user (a refresh cycle puts it front & center again anyway)

[bradtchapman]

If an administrator chooses to restrict the deferral button as in #549 , but the end user insists that they need to move the Nudge window out of the way temporarily because it must not be seen on screen—for example, in front of a news anchor / reporter, or a Mac being used as a prop in a Live broadcast on Saturday Night—please provide a key that will allow the Nudge window to be moved around.

[erikng]

What conditions should the window be allowed to move? All of them?

There's many states within Nudge.

[erikng]

A new key will be added allowMovableWindow in the userExperience payload. Because of the comment from a few weeks ago, I've had to be pretty prescriptive about the behavior and I will be up-front that this behavior is not preferred and I will provide very little support on this.

62178c2

All other logic is now lost because of this change (detecting screens, detecting new mission control sessions, etc) or I will end up with like 10 keys to support this request.

It's a hammer, use it with caution.