Export images / movie

[jourdain]

• Export could be an image per field per time (or field selected in animation) step.
• Export could be the full grid of all the loaded fields.
• Export a movie instead of a picture

[huiwanpnnl]

Giving @jourdain a little nudge... A user said today that he greatly appreciated our version 1 release, and that the export of images and animations was the only key thing he felt was missing there :-)