feat: add sceneManager; add playerSpawnPos to sceneEntrance and sceneManager; update player node to use value from sceneManager; make sceneManager autoloaded;

Scenes/SceneManager/scene_manager.gd

@@ -0,0 +1,12 @@
+extends Node2D
+
+var player_next_scene_spawn_pos: Vector2
+
+# Called when the node enters the scene tree for the first time.
+func _ready() -> void:
+	pass # Replace with function body.
+
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+func _process(delta: float) -> void:
+	pass