Bosch Router Table Inserts (with tabs)

This OpenSCAD code generates router table inserts for the Bosch RA1181 Benchtop Router Table (which I have), and presumably for the Bosch RA1171 Cabinet Style Router Table (which I do not).

The design is more similar to OEM inserts with tabs to lock the Insert in place than the Source Thing from which it was remixed. Very little original code remains, though without it I would likely not have completed my first "useful" OpenSCAD design.

My initial design used thinner "ribs" and a deeper "tab overhang" based on measurements from the Bosch inserts, and the tabs promptly snapped off when inserting it. The current parameterization is working well so far.

The included json file contains several parameter presets available as of OpenSCAD Release 2019.5

Revisions:
2020-11-16: fix bug in `notch` function that was masked by `ribHeight` and `insertHeight` having the same value. Thanks user rybu for catching that