Source Line Previewing

[Sythivo]

Adds source line previews with line peaks on reported failures.

[itsfrank]

Nifty! I think I personally would find this a bit noisy, so I would definitely not want this to be the default, however I have gotten other requests for more verbose output.

I think I need to figure out if I want to either:

• Add an optional configuration object to lune_console_reporter's init function
• Add other variant reporters

Right now I am extremely busy with the year ending and our final releases going out at work, but I will think on this and implement something later in december.

I think something like this would be a good way forward:

lune_console_reporter.init({
    peek_assertion_context = true,
    peek_context_range = 3,
})

The main inspiration for frktest was Catch2 which does show the assertion line, so I am really not against this, I just like how clean the current output is so I want to keep it as the default.