hydrogen: [DISCUSS] Save breakpoints

It would be awesome to save the breakpoints even if atom is restarted.

I see two ways of doing this:

1. Save the position of the breakpoints to a separate file in the ./hydrogen/ folder. A downside would be, that it will break if the file is changed outside of atom.
2. Use text to identify breakpoints like # %% and parse the file before execution or add markers to those positions. We could make this language independent by using something like this to get the right comment symbol.

I tend towards the second option. What about you?