Select Entities from the currently running Scene

[jbuehler23]

• [ ] look up entities by name
• [x] from the scene using picking
• [x] from the inspector
• [x] show selected entities in the inspector
• [x] clearly show selected entities in the world via an outline
• [x] one entity
• [ ] multiple entities

[Freyja-moth]

We should consider allowing entities to be selected/filtered based on components.