Issue description

PhantomCamera version: 0.8.2.3

I'm working on a couch co-op 3D game where players can dynamically join and leave a session. I'm using a PhantomCamera3D with follow mode Group and auto_follow_distance enabled to have all players visible on a single screen. It is possible to have a session with only one player, too. However, with a single player only, the camera does not respect the auto_follow_distance_[min|max] settings but falls back to follow_distance - which is not configurable in the properties when auto_follow_distance is enabled.

My expectation as a user would be that either the auto_follow_distance_min is used in that case or that the follow_distance property is visible for configured, too. This would also need some documentation for both cases.

Steps to reproduce

Create a basic setup with a Group follow 3D camera. Set follow_distance to some value (e.g. 5). Now enable auto_follow_distance and set auto_follow_distance_min to some different value (e.g. 50). Add a single target to the follow_targets array.

Now when you run the scene, you see that the camera uses follow_distance of 5 instead of auto_follow_distance_min of 50.

(Optional) Minimal reproduction project

You can use the 3d_follow_group_example_scene from the example scenes and adjust it as described in "steps to reproduce".