Support be-js connected code in funtests

[tjpalmer]

• Make be-js always produce a .internal.js that always exports all top levels
  • This actually cuts over 100 lines of net code in this pr, even with longer test outputs
  • Net line increase is from both connected code support and pretty class names
• Make be-js class names pretty when possible, so connected code knows how to reference them
• Support connected code in a separate module so its imports don't clutter Temper-built module namespace