Add a map-loader sctipt

scenes/maps/base/single_spawn_controller.gd

@@ -0,0 +1,11 @@
+extends Node3D
+
+var busy: bool = false
+
+# Called when the node enters the scene tree for the first time.
+func _ready() -> void:
+	pass # Replace with function body.
+
+func choose_spawn_location() -> Vector3:
+	busy = true
+	return global_position