Apply clang format as proposed in T53211.
For details on usage and instructions for migrating branches
without conflicts, see:
https://wiki.blender.org/wiki/Tools/ClangFormat
D2311 by @ianwill
This is the radial control that appears when we change the size of a brush in sculpt and vertex and texture painting modes, by pressing "f".
Also includes a new built-in shader that can be useful in other places.
Part of T49043