MoviePy 2.X no longer using moviepy.editor

[NerdyN00B]

In pims/pims/display.py there is an import from moviepy.editor import VideoClip. In 2.X of moviepy this import became from moviepy import VideoClip. Using newer versions of moviepy therefore causes issues.

[NerdyN00B]

I made a pull request which should fix the issue

#472

This also fixes another occurrence of moviepy.editor