(part 2) Optimized stretchy ik with elbow/knee lock and bomb-proof global scale tutorial

Set up a robust and clean/elegant stretchy ik system with elbow/knee locking, "bomb-proof" global scaling, and an elbow/knee "nudge" control to help with popping.

This is a 2 part tutorial, where the first part gives a demo of the resulting system, as well as discussing and explaining some of the methods that will be used such as:
using the distanceBetween node instead of the measure tool
using joint translates instead of scales
the need for global scale compensation

The second part takes you through the steps for creating this stretchy ik setup. I start with a simplified example and also show the typical global scale compensation seen in many other tutorials. Then I go through the bomb-proof global scale as well as the nudge, and finally the 'cleanup' stage for the much cleaner and more elegant node network for the stretchy ik system. The idea with this being to help show how to work through some rigging problems, and then optimize it afterward.

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Small note: in describing the finalized node network, I forgot to specifically mention how the stretch no longer needs the separate blendTwoAttr nodes for up arm and lo arm. It's handled by the same blendTwoAttr because the scale multiplier value will be the same for both.

00:00 - intro
01:31 - understanding stretchy mechanics
08:22 - understanding scale compensation
11:46 - bomb-proof scale compensation
17:51 - adding the nudge
24:33 - cleaned up version
28:37 - final thoughts