Refactor target position argument

Make it more explicit.

CharTween.gd

@@ -5,8 +5,8 @@ export var default_duration = 0.1
 func connect_into(o):
 	connect("tween_completed", o, "_on_tween_completed")
 
-func move_char(c, t_pos, duration = default_duration):
-	interpolate_property(c, "position", c.get_position(), t_pos, duration, Tween.TRANS_LINEAR, Tween.EASE_OUT_IN)
+func move_char(c, target, duration = default_duration):
+	interpolate_property(c, "position", c.get_position(), target, duration, Tween.TRANS_LINEAR, Tween.EASE_OUT_IN)
 
 func rotate_char(c, from, to, duration = default_duration):
 	interpolate_property(c, "rotation_degrees", from, to, duration, Tween.TRANS_LINEAR, Tween.EASE_OUT)