Extend move API to handle single point case

[s1hofmann]

mouse.move expects an array of points to follow along.

Considering the edge case of a single point, move could simply fall back to setPosition

Originally posted by @s1hofmann in #498 (comment)

[s1hofmann]

Implemented in https://github.com/nut-tree/nut.js/releases/tag/v3.1.2