Allow running specific (/last) day (and/or part) from the regular executable

[idanarye]

cargo aoc is running the last day by default and has flags for choosing which year/day/part to run. But the executable itself does not have these flags, and it'll always run all the days.

It would be convenient to give the executable the ability to run specific days, so that we could use cargo run -- -d13 or cargo run -- --last-day (new flag, in case you want to keep the old behavior when no flags are given) instead of cargo aoc. cargo run is more convenient since it is more customisable (I mainly care about the --quiet flag), does not rebuild in release mode on every run.

[galop1n]

It is maybe because i am still new to rust and cargo, but i feel it is a good thing to have. I was lookign for it too in order to spawn the exe from VS code to debug