scenes/levels: add a basic pause system

imperium-porcorum.love/scenes/levels/init.lua

@@ -128,6 +128,10 @@ function Level:update(dt)
     assets:update(dt)
     self.camera:update(dt)
   end
+
+  if self.keys["start"].isPressed then
+    self.pause = (self.pause == false)
+  end
 end
 
 -- DRAW FUNCTIONS