Support hex and other numbers in ranges

[edemaine]

Fixes #342

Originally, I used eval, because at this point we should have guaranteed that the Literal is of a reasonable form. But this seems a little risky. Instead I switched to parseInt which seems to cover the cases we care about (given CoffeeScript's weird semantics with floats).

I tried to get BigInt literals to work too, but they're annoying to work with because even += 1 doesn't work (can't mix BigInts with regular numbers). Anyway, they're unlikely to be useful, as they likely have length more than 20.

[STRd6]

Needs one more check to support:

[0..0b10]
[0..0o10]

https://coffeescript.org/#try:%5B0..0b10%5D%0A%5B0..0o10%5D

[edemaine]

Oof, I didn't realize parseInt doesn't automatically recognize binary or octal literals.

I ended up writing a general module.literalValue helper. Could be worth another review.