What/Why

I wanted a way of making a single executable release file, so I added that. I also made some minor enhancements and reorganization

Summary of what I changed

I changed the names of a couple of variables to make it make more sense
I changed the enumeration on certain types
- If revealed is now an attribute, then I don't need to treat negative numbers as unrevealed and positive numbers as revealed.
- Now, numerical values range from 0 to 9 with 1-8 being the actual values, 0 being a blank and 9 being a mine
I added my actual username and date to the License Copyright
I added instructions on how to make a release (for my own benefit as well)
I renamed and moved files (as well as added lib to sys.path) to make it possible to run it by python3 app