Update "Public" Properties to Use Getter/Setter

**Description**
- The first several classes I implemented used public attributes that other classes also access immediately. It would be worthwhile to change these to use getters/setters.
- [This link](https://answers.unity.com/questions/1025164/getset-variable-vs-normal-public-variable.html) shows a good example of how to implement getters and setters in C# for private properties.