Log Message:
tex-circuitikz{,-doc}: update to 1.6.2

Several more styling options for elements (body diodes, transformers, crossing),
a clock wedge shape for logical circuits, and documentation updates for ConTeXt,
mainly noticing the (upstream) elimination of the thin `siunitx` layer
compatibility macros.

- there is no `siunitx` support for ConTeXt, point to their `units` package
- Add styling of `transform core` lines
- Add `scale` to the bodydiode options
- Add styling of crossing vertical line
- Add `clockwedge` shape