#2 Made a new class for both of the cars.
Player and enemy car movement now in the same script but

Still needs to be fixed:
Tachometer arrow doesnt move when pressing gas button.
#2 Enemy and Player car in the same script and tachometer arrow bug fixed.
#2

* Removed attached EnemyCarMovement and MainCarMovement from GameScene
* Deleted EnemyCarMovement and MainCarMovement from the project.
* Fixed errors when EnemyCarMovement and MainCarMovement was deleted.