Get tests passing without engine connection (#155)

We can create a enginelessExecutor that can be used for many of the
executor tests that will be much more performant for tests that don't
need the engine to actually do any modeling work.

src/lang/std/std.ts

@@ -95,7 +95,7 @@ const legAngY: InternalFn = (_, hypotenuse: number, leg: number): number =>
 
 export const internalFns: { [key in InternalFnNames]: InternalFn } = {
   // TODO - re-enable these
-  // rx: rotateOnAxis([1, 0, 0]),
+  // rx: rotateOnAxis([1, 0, 0]), // Enable rotations #152
   // ry: rotateOnAxis([0, 1, 0]),
   // rz: rotateOnAxis([0, 0, 1]),
   extrude,