fix: port to the new menusystem the pause menu

examples/scenes/gameplay/plateform/pause.lua

@@ -7,26 +7,27 @@ local ResumeWidget  = Widget.Text:extend()
 local RestartWidget = Widget.Text:extend()
 local ExitWidget    = Widget.Text:extend()
 
+local MENU_NAME = "PauseMenu"
+
 function PauseMenu:new(scene)
   self.scene = scene
   local screenHeight, screenWidth = core.screen:getDimensions()
   local w, h = 424/4, 240 - 48*4
   local x, y = 3*w/2, 24*4
-  PauseMenu.super.new(self, scene.menusystem, "PauseMenu", x, y, w, h, 3)
+  PauseMenu.super.new(self, scene.menusystem, MENU_NAME, x, y, w, h, 3)
 
-  ResumeWidget(self)
-  RestartWidget(self)
-  ExitWidget(self)
+  ResumeWidget()
+  RestartWidget()
+  ExitWidget()
 end
 
 -- WIDGETS
 -- All widgets used by the pause menu
 
-function ResumeWidget:new(menu)
-  self.scene = menu.scene
-  local font        = self.scene.assets:getFont("medium")
+function ResumeWidget:new()
+  self.scene = core.scenemanager.currentScene
   local label = "resume"
-  ResumeWidget.super.new(self, menu, font, label)
+  ResumeWidget.super.new(self, MENU_NAME, "medium", label)
 end
 
 function ResumeWidget:action()
@@ -34,11 +35,10 @@ function ResumeWidget:action()
   self.scene.menusystem:deactivate()
 end
 
-function RestartWidget:new(menu)
-  self.scene = menu.scene
-  local font        = self.scene.assets:getFont("medium")
+function RestartWidget:new()
+  self.scene = core.scenemanager.currentScene
   local label = "restart"
-  RestartWidget.super.new(self, menu, font, label)
+  RestartWidget.super.new(self, MENU_NAME, "medium", label)
 end
 
 function RestartWidget:action()
@@ -46,11 +46,10 @@ function RestartWidget:action()
   self.scene:restart()
 end
 
-function ExitWidget:new(menu)
-  self.scene = menu.scene
-  local font        = self.scene.assets:getFont("medium")
+function ExitWidget:new()
+  self.scene = core.scenemanager.currentScene
   local label = "exit"
-  ExitWidget.super.new(self, menu, font, label)
+  ExitWidget.super.new(self, MENU_NAME, "medium", label)
 end
 
 function ExitWidget:action()