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IK: Elbow goals should rotate more aggressively #740

@Rikketh

Description

@Rikketh

Is your feature request related to a problem?

Based on the april 12th-13th test.

Currently elbow IK goals are seemingly mostly pointing downwards no matter the hand rotation or position. It should instead be more aggressively following the hand rotation.

Describe your preferred solution

Empirically-derived setup that worked for us a good while back that's simple enough is as follows:

Starting with palm pointed outwards, thumb pointed down, a 270° CW rotation on the right hand (CCW on left) remaps to a 160° arc around the elbow looking at/away from hand goal from pointing 45-60° CCW up to pointing slightly inwards at the chest, to around 10-15° CW.

Paired with chest capsule avoidance it should provide a more aggressive and responsive elbow rotation that ideally can't have elbows point up 180° without rotating the chest.

Describe any considered alternatives

Elbow goals can be made to follow hands rigidly without an arc offset, but this will introduce unnatural elbow positions for relaxed hand positions.

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