feat: add initial People Playground mod development kit

extracted_wiki_content/internalReference/randomprefabspawnerbehaviour.txt

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+URL: https://wiki.studiominus.nl/internalReference/RandomPrefabSpawnerBehaviour.html
+Title: People Playground Modding - RandomPrefabSpawnerBehaviour
+==================================================
+
+public class RandomPrefabSpawnerBehaviour
+Inherits MonoBehaviour
+Spawns a random prefab in random position in a shape
+Nested types
+RandomPrefabSpawnerBehaviour.Shape
+Fields
+public GameObject[] Prefabs
+The prefabs to choose from. Cannot be null or empty. Entries cannot be null.
+
+public float SpawnChancePerPeriod
+[Range(0, 1)]
+The chance per PeriodInSeconds for a prefab to be created
+
+public float PeriodInSeconds
+The period duration in seconds. This determines how long the behaviour will wait until deciding whether or not to create a prefab every loop.
+
+public Shape SpawnShape
+The Shape to use for choosing random locations in local space
+
+public Vector2 Offset
+The offset of the shape in local space
+
+public Vector2 LocalTo
+[NaughtyAttributes.ShowIf(nameof(IsLine))] [NaughtyAttributes.BoxGroup("Line")]
+If the shape is a line, these control the two points in local space