Camera-Port / Mapping inputs

[GeraldKimmersdorfer]

Issue includes:

• Implement simple test scene (cube)
• Use camera from nucleus
• Forward key inputs

Goal:

• At least quake camera works to fly around a debug cube

Non-Goals:

• Picking for orbital camera

[GeraldKimmersdorfer]

done: #86e1efb6f634f796ce5378bf05e85746d05efc32