Pitch Calibration for Full Body mode, to better calibrate the users knees with the floor.

[CMC-Git-Report]

Is your feature request related to a problem?

This issue is directly related to a previous ticket: #501

I've noticed that after calibrating the Full Body with neck up, then neck down, and then neck facing forward that the body calibration increases in accuracy. After playing with multiple calibrations, the user eventually properly finds the "floor" in Basis where the knees can properly bend. When using the 0.086E build, I've been able to properly bend my knees to the floor about 90 - 95% of the time this way.

Describe your preferred solution

Pitch calibration should just be an integrated feature into the calibration that users do once on loading in, and then they're done. After that, looking forward and calibrating like typical should just work.

(It could be a tough ask for people with reduced movement in their neck, so it should be an optional setting in the calibration for people to enable.)

Describe any considered alternatives

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Additional Context

A similar technique is used by dancers in VRC to forcibly straighten or bow their legs.