Use user input filename for analysis

[Kit-p]

Asks user to input the path to file for analysis.

@Verisimilitude11
The reason it didn't work before is that you closed the Scanner. When you close a Scanner, it also closes the underlying stream, which in this case is System.in, thus any other Scanner wrapping System.in will fail to read subsequent inputs.
Out of the 2 approaches (suppress the warning and not close / use a global Scanner and pass it around), I chose the latter as it is clear that System.in won't be needed after the main() function, so we can safely close it.

Feedback is welcome!

Closes #29.

[VerisimilitudeX]

This is great! Thanks for explaining it so thoroughly to me - I really appreciate it! Since it is October 1st in your time zone, this would be eligible for Hacktoberfest, correct?

[VerisimilitudeX]

Looks great!

[Kit-p]

This is great! Thanks for explaining it so thoroughly to me - I really appreciate it! Since it is October 1st in your time zone, this would be eligible for Hacktoberfest, correct?

I suppose it does count, cheers!

[VerisimilitudeX]

@Kit-p I noticed that you write very high-quality code. Do you have any other suggestions/ideas on what can be done to improve the code base? Anything from major to minor changes would be much appreciated!

[Kit-p]

@Verisimilitude11 Thank you, you keep the project very maintainable. I think your current refactoring strategy should work well for the long run, I would say just keep it up!

One thing about user experience though, keep the program running and ask the user to retry may be more user-friendly than quitting with an exception. At some point in the future, a TUI or even GUI should be implemented to really take the project to the next level.