Implemented Custom InputManager
1. The controllers for the two players are now separated
2. Each controller configuration (there are 4, two keyboards, two gamepads) can be changed in the inspector of the SceneManager.
3. Uses KeyCode for faster compile time in each field.
4. The axis for the movement are defined in the project settings for easy handling.
5. Controllers are not working right (Alpha phase)
6. Id's for the controllers are Keyboard1, Keyboard2, Controller1, Controller2