Allow for leading 0 in mod names about aoc

[IceSentry]

You can already do that, you just have to pass it 01 instead of 1, the macro doesn't car as long as it's a valid integer. You could even do 001 if you wanted.

[remi-dupre]

It could still be interesting to get a better error message (and eventually get more robust, but I'm not sure if that last on wouldn't be annoying).

[swlody]

Not really sure why I thought this didn't work, maybe it didn't work in a previous version?

[remi-dupre]

That's possible as I rewrote most of the parsing mechanism here