Add Type Hints using typing Module

[andrewt110216]

I have decided it is worthwhile to add type annotations throughout the code.

Pros

• There are a number of composite data structures used, to represent board coordinates, jumps/moves, possible moves, etc. Type hints will make it easier to quickly understand these structures and allow the IDE to be helpful in writing new code
• Makes the code more professional and easier to understand by an outsider
• I get to practice using the typing module

Cons

• Takes time
• Makes lines longer which may hurt readability, if, for example, it causes me to shorten variable names or expand single lines into multiple lines
• May cause me to add additional code just for the sake of typing, which I don't feel great about

[andrewt110216]

Added typing to all source files