gamecore/scene: scene should register themselves

examples/test_scene/init.lua

@@ -28,8 +28,6 @@ function TestScene:new()
   TestScene.super.new(self)
 
   self.i = 0
-
-  self:register()
 end
 
 function TestScene:update(dt)

gamecore/modules/scenes.lua

@@ -35,6 +35,8 @@ function Scene:new()
   self.assets     = Assets()
   self.menusystem = MenuSystem()
   self.keys       = core.input:getKeyList()
+
+  self:register()
 end
 
 function Scene:register()