Find a better way to add/structure entities

[DominikHorn]

JavaFX by will render the last added node on top of all other nodes/last. This is a problem as newly added bubbles will be drawn over the player. Tasks:

• [TODO] Change code to fix this issue
• [TODO] Refactor system that adds entities (maybe this is intertwined with the above task)
• [TODO] Instead of having a global InputProvider (Initialized and distributed via GameController), that the PlayerEntity has to fetch in order to update its position, the chosen InputProvider (MouseInput/KinectInput) could just send an Event, for Example a PlayerPositionChangedEvent, through the global EventManager system

[DominikHorn]

• [FIXED] Change code to fix this issue
• [MAYBE-FIXED] Refactor system that adds entities (maybe this is intertwined with the above task)
• [TODO] Instead of having a global InputProvider (Initialized and distributed via GameController), that the PlayerEntity has to fetch in order to update its position, the chosen InputProvider (MouseInput/KinectInput) could just send an Event, for Example a PlayerPositionChangedEvent, through the global EventManager system