Code cleanup, string formatting, version importing

[byarmis]

• Made it easier to bump the version-- now, just have to update the version in one place instead of two
• Changed the string formatting so people don't need to remember \ before ' in some strings
• Changed constant names to be more descriptive
• main() function now returns a string instead of directly printing, allowing other tools / functions to import and run the program without printing unless they want to
• Added backwards-compatible type-hinting

[diptangsu]

That is a wonderful amount of refactoring! Thanks!
I only wrote this to learn how a python package can be published to PyPi, never really thought someone else would even touch this code LOL!

However, this particular change does not look right to me. I haven't really checked it, I'll do it once I get some time.

Since this is a python module, we need to run it using the -m flag. Python's import system is pretty weird even when you properly understand it actually.

If you think it's not a mistake on your part, just let me know and I'll merge it, otherwise just make that one change and I'll merge it!

[diptangsu]

It is wrong. I will make the changes and fix it.

If it's a module, we can't run it as a python script; we need to run it with the -m flag, in which case it breaks.

[byarmis]

I apologize for that, I didn't realize that the proper way to run it was with python -m, not just python

[diptangsu]

No problem brother! It's two people now who learnt something new from this project! haha!
I didn't know this either until I wrote this code!