Initial Framework for Overlap Block Rule

[Jxwoon]

What it does: From markdown, I am extracting the sprite kinds. Then in tutorialValidator.ts, I am comparing the two sprite kinds used in an overlap block from the user and markdown.

To do: Need to store the user's sprite kinds in a map in a format similar to this on line 52 in tutorialValidator.ts

```validationOverlap
{"kindOne":"SpriteKind.Projectile", "kindTwo":"SpriteKind.Enemy"}
```*