Organize files into some new folders

documentation/library_changes.md

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+
+
+function_pickup.gd:
+	Add nil check in func _pick_up_object(target: Node3D)
+	440: if target and target.has_method("pick_up"):
+		target.pick_up(self)
+
+
+Add (what) to singal dropped in snap_zone
+	signal has_dropped(what)
+	# Pickup Method: Drop the currently picked up object
+	...
+	func drop_object() -> void:
+		if not is_instance_valid(picked_up_object):
+			return
+
+		# let go of this object
+		has_dropped.emit(picked_up_object)
+		picked_up_object.let_go(self, Vector3.ZERO, Vector3.ZERO)
+		picked_up_object = null
+		highlight_updated.emit(self, enabled)