Sonoff Mini inline case with Rocker

Remix of Jonweb's case to add a rocker switch.

Changes are:

- Cut out in lid for a 10x15mm rocker switch. (cutout size 8 x 14mm)
- Closed off the hole to the mini reset button.
- Shifted the mini to one end of the case to avoid clash with the rocker.
- Dropped the cable entries lower in the case for better routing around the relocated sonoff, and switch.
- Narrowed the whole thing by 2mm as the mini was quite loose in old case.
- Resized the screw holes so the case can be assembled with 3mm countersunk self tappers or woodscrews (or 4 gauge)

The STL for the main box is slightly corrupt as there was lots of tiny missing faces when I imported the original file to sketchup, and it was tricky to repair. Gives error message in Cura for me but slices and prints fine so haven't bothered trying to fix any more.