move wayfinder files to Flumi folder

flumi/addons/SmoothScroll/scroll_damper/linear_scroll_damper.gd

@@ -0,0 +1,33 @@
+extends ScrollDamper
+class_name LinearScrollDamper
+
+
+## Friction, not physical. 
+## The higher the value, the more obvious the deceleration. 
+@export_range(0.001, 10000.0, 0.001, "or_greater", "hide_slider")
+var friction := 4.0:
+	set(val):
+		friction = max(val, 0.001)
+		_factor = pow(10.0, friction) - 1.0
+
+## Factor to use in formula
+var _factor := 10000.0:
+	set(val): _factor = max(val, 0.000000000001)
+
+
+func _calculate_velocity_by_time(time: float) -> float:
+	if time <= 0.0: return 0.0
+	return time * _factor
+
+
+func _calculate_time_by_velocity(velocity: float) -> float:
+	return abs(velocity) / _factor
+
+
+func _calculate_offset_by_time(time: float) -> float:
+	time = max(time, 0.0)
+	return 1.0/2.0 * _factor * time*time
+
+
+func _calculate_time_by_offset(offset: float) -> float:
+	return sqrt(abs(offset) * 2.0 / _factor)