Interface: Interface controller

[Kossinator]

Create a interface controller and add functionality for controlling windows, panels and other elements.

• [ ] Handling for different windows.
• [ ] Handling for scene loading.
• [ ] Define a default folder structure for all ui-prefab elements.
• [ ] Functionality for dynamic element loading from prefabs.

[Fanmade]

Why did I get this? I'm not at my workspace for at least another three weeks ;)