Add the new SI prefixes

Also reduce the minimum height for the world when manually entering
a size -- it used to be a nanometer. The minimum exists so that
the world size never becomes 0. Perhaps this should be changed.

macrovision.js

@@ -5992,7 +5992,7 @@ function updateWorldHeight() {
         return;
     }
 
-    const newHeight = Math.max(0.000000001, value);
+    const newHeight = Math.max(1e-40, value);
     const oldHeight = config.height;
 
     setWorldHeight(oldHeight, math.unit(newHeight, unit), true);