Improve LightingManager API 🔦

[bitbrain]

The current implementation lacks on functionality such as removing lights again. Also the API is quite hard to use right now.

Adding and removing lights

It is currently quite annoying to specify a light id. Why is this even required? Generate one! Also return the light itself:

PointLight light = lightingManager.createPointLight(pos, radius, color);

Make it simple to remove lights again:

lightingManager.removeLight(light);

Attaching lights to objects

Right now, it is quite difficult to attach lights. Change that:

lightingManager.attach(object, light);