Teknic ASU-FR510 mounting plates

Teknic ASU-FR510 analog board mounting plates. Single and dual plate versions. For use with heat set inserts. One hole on the PCB isn't aligned with the other three. This mount takes that into account. Useful for mounting the unit to the inside of an enclosure.

Also added a set of mounts to mount one to 35mm DIN rail. Holes are sized for 4-40 heat set inserts.