Animation tools improvements (image sequence, UHD-2, settings)

[Shadow]

Hello,

here are a few suggestions to improve the animation tools.
Providing more export options would be nice :
- UHD-2 (7 680 × 4 320) can be useful to later convert the video in UHD or even 1080p, and therefore reduce aliasing issues ;
- maybe an "export as image sequence" option ?

A HUGE improvement would be for Metashape to remember the last settings used : when tweaking an animation, being forced to set the resolution and framerate each and every time is a little bit annoying.