Initial Setup

This commit puts in place the work done so far on the project.

Features Added:
- Basic player movement
- When the player clicks, a preview of what they are about to place
appears, when they click again this preview solidifies into a game
object

Bugs/Errors:
- The preview wall is not central to the player's camera
- The preview wall's Y rotation is not locked, and therefore the wall
can be placed at an angle so, when it solidifies it will fall apart
instantly