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+TODO:
+  * Make flat stem support default
+  * make flat inner shape default
+  * support repositioning to print on the back surface of the keycap
+  * implement regular polygon for skin extrusions
+  * switch to skin-shaped extrusions by default
+  * kailh choc has a non-square key unit; should I get that working for layouts etc? 
+  * move everything over to layouts requiring a child key
+  * add an "errors" or "warnings" or "suggestions" echo section in key.scad, right when the key is being made, so the errors don't get lost / repeated