Model tweaks for Axis & Allies, add unit-chip model.

board-games/axis-and-allies/fighter-japan-mitsubishi-zero.scad

@@ -1,4 +1,4 @@
-//$fn=50;
+$fn=50;
 ep=0.1;
 
 // Create a module so you can call it like a normal OpenSCAD function, like
@@ -54,4 +54,4 @@ module fighterZero() {
   }
 }
 
-//fighterZero();
+fighterZero();