Better plane animation between update

[Ysurac]

Animation on 2D mode are not smooth. 2 choices:

• Always use estimated position and not latest know position
• Put a little delay, so it's only estimated position between each know position

[Ysurac]

Better estimation in commit 56e07e699b7067a516d6099ed3f2bb82575892f1 It will be difficult to do better if I keep realtime. But for estimation it's quite good.