Recipe tracebacks are currently verbose and unhelpful. We can improve these a lot

  * If recipe's RunSteps is on stack, remove all stack frames above
  * If the stack ends with <user_code> -> <engine_code>, remove the last frame, print the exception text
  * If the stack ends with more than one engine_code block, ask the user to file a boundary check bug against the engine.
  * Replace all paths with some better notation (i.e. PACKAGE[engine]/...)
  * Remove all decorators and other meta shit from stack
  * Preserve original stack trace in proto
  * Add `$recipe_engine['full_frames'] = True` property to avoid this cleanup. Ex.
PACKAGE[user_repo]/recipes/foo.py:12 -- RunSteps(...)
    api.wat
PACKAGE[user_repo]/recipe_modules/foo.py:12 -- api.foo(...)
    api.wat
SomeException: Your pants are on fire.