Draft: Make Rotate and Shear care about user's "Use anchor point" choice

The patch makes Krita transform tool care about user's selection of "Use anchor point" button in Rotate and Shear modes (they also handle Alt modifier now).

Before the patch only scaling mode cared about the "Use anchor point". We somehow considered that Rotation and Shear modes should always use anchor point. But it seems like it creates some confusion, see this bug: https://bugs.kde.org/show_bug.cgi?id=404606

So my question to painters is, does the new behavior of the rotation and shear modes look useful/understandable for you now?

The button I'm talking about is this one: