VidExies add framewise export settings for resize, scaling or delay

As dramatically demonstrated in this screenshot from a saved movie, when resizing the actual particle origin range and particle sizes, there's an uncomfortable delay depending on the particle type.

In some cases, it may make sense to not resize the particles, just have them on a bigger canvas.

Or, to have a recording delay so there's say 5 seconds for the falling confetti to be all resized before the video appears.

Note that the current VidExies approach resizes the SKScene so you're getting the highest possible resolution of the particles, to match the video output.

The other approach is the equivalent of using `scaleMode = .resizeFill` where we would leave the SKScene at its original size and do the upsizing with the frames grabbed from the SKRenderer.