Scene changing #55

Features needed/maybe needed

• Implement a scene loader and unloader
• Change scene definitions to be YAML based, rather than a custom script
• Implement routing or UI to load other scenes

Scenes needed

• Overworld
• Object Inspector ( custom background and single object preview with orbit + state controls )
  • Vehicles - Player, Raven, Cargo Ship
  • Structures - Extractors, Refinery, City
• Building interior
  • Overhead of hangar with different interactive areas