Adds a new API to set this type, and an option to the Avatar App.
* "eye" - Match the user eyes with the avatar eyes. The previous default behavior.
If the avatar skull is larger then the user, it can cause the avatars body to lift off of the ground when the user looks down.
* "head" - Match the user head with the avatar head. The new default behavior.
This prevents the body from lifting off of the ground while wearing a large headed avatar. But can cause an offset between the users eyes and the avatars eyes.
Previously getCenterEyeCalibrationMat() would return the average eye position for an avatar, if the eyes are missing.
Now we fall back to using the HeadCalibrationMat() and adding an offset from the head to the center of the eyes.
This is more accurate for characters that don't quite have human proportions.
2.added step.js and cg_lean.js to the developer folder
3.added menu item for toggling the hips following between head and hips
4.added new function to return true if the root of MyAvatar is translating
to be under the head. Used to smooth the path of the hips
5.added computeCounterBalance to MyAvatar.h and cpp
6.added the menu item under developer/avatar to enable debug draw of the base of support in menu.h menu.cpp MyAvatar.h MyAvatar.cpp
7.added head yaw into the calculation of the hip rotation for the center
of gravity. This is already was happening in the deriveBodyFromHMD code
that is default
8.Changed Constants in Avatar constants for the base of support
9.fixed the over rotation of the shoulders
10.fixed scaling problem in cg computation
11.added room for going up on the toes without stretching
* Domain settings version has been bumped from version 2.0 to 2.1
* Old domain settings for avatar scale will be auto-converted to avatar height
* Avatar code has been changed so that limitDomainScale() works with the new height limits
* Avatar getUnscaledEyeHeight() was added to C++.
* MyAvatar.getHeight() was added to JS.
