Euler filter option to filer 180 flips

[herronelou]

Euler filter doesn't solve issues on the card below, which flips every few frames.

set cut_paste_input [stack 0]
version 11.3 v5
push $cut_paste_input
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[herronelou]

With hindsight, this was never meant to work, as Euler filters prevent flipping in between keyframes, but preserves the exact orientation on keyframes. Would be useful to have an option to fix this sort of issue though.