binary feeler gauge

In most cases a vernier scale is everything needed for taking measurements, however sometimes it’s not the best instrument (e.g. finding out the perfect hight for the fix of a wobbly table) and inserting something with just the right height into a gap between objects would be a much better solution for measurement.

The following can be adjusted:
* unit type (1 mm, 100 µm or both)
* hight of feeler (in 2^n so n=0 -> 1, n=1 -> 2, n=2 -> 4, etc.)
* case (if you want one)
* feeler (generate o