game: move ui stuff to own folder

scenes/managers/ui/pause_ui.gd

@@ -0,0 +1,32 @@
+class_name PauseUI
+extends Control
+
+
+func _ready() -> void:
+	pass
+
+
+func toggle_pause_ui() -> void:
+	if visible:
+		visible = false
+		Engine.time_scale = 1.0
+		return
+	visible = true
+	Engine.time_scale = 0
+
+
+func _on_resume_button_pressed() -> void:
+	toggle_pause_ui()
+
+
+func _on_options_button_pressed() -> void:
+	pass  # Replace with function body.
+
+
+func _on_exit_button_pressed() -> void:
+	get_tree().quit(0)
+
+
+func _on_new_game_btuton_pressed() -> void:
+	var new_scene = load("res://scenes/main.tscn")
+	get_tree().change_scene_to_packed(new_scene)