Is it possible to distinguish between `pyxel run` vs `pyxel play` in the code?
I've really been enjoying learning and use Pyxel! It's intuitive and simple while being flexible. Something I've been wondering as I learn the library is if there's a way to distinguish between debug and release builds?

In the Python, is there a way to do something like this?

``` python
def draw():
    if pyxel.debug_build:
        # draw hitboxes
```

Checking if the current running game is via `pyxel run` or `pyxel play` would be great for assisting the game development process. I'd like to use it to add an invincibility toggle, display hitboxes, and quickly modify game info that I don't want players to have but would make it easier to make the game.

I searched around and couldn't find anything like this. If it doesn't exist, I'd be happy to help contribute something along these lines. Thanks!