Feature/vr support

[zzhhaa10000]

• Added support for enabling VR through the configuration file (sample-config.json).
• Introduced "UseVR": true/false option:
  • When true: VR camera is attached to Ego vehicle and MainCamera is disabled.
  • When false: simulation runs in normal mode with MainCamera.
• Added installation guide for Steam, SteamVR, and ALVR.

[mackierx111]

Instead of instantiating game objects at runtime, it's better to place them in the scene beforehand and toggle their active state during scene initialization.

[leonidaas]

I've tested it and it only runs the first time I start it. The second time it doesn't get streamed to my Meta Quest 3.
I always have to restart Unity completely to re-run it on my Quest.

Edit:
to be exact this error occurs:

[leonidaas]

friendly ping

Were you able to reproduce the same error?

Steps to reproduce:

1. Run Unity Project with VR enabled.
2. Stop it
3. Run it again
4. Error: SteamVR not initialized.