bugfix: keep Viewport dimensions more up to date

Scenario:
  1. I connect to carousel.love
  2. I try to press C-n, nothing seems to happen
  3. I quit and restart and get this cryptic error:

    SDL error: window too large

      "width": 19103,
      "height": 9849.984375

I can manually edit config to adjust width and height and restart
driver.love.

I don't really understand all the details of how this comes about.

While investigating this, however, I noticed one thing: in step 2 the
new node is indeed being spawned, it's just happening out of viewport
because Viewport dimensions are much larger than the window.

Once I started looking for it, I noticed this stale information in many
apps.

Let's see if keeping viewport dimensions up to date causes the scenario
above to stop occurring.

0012-on.initialize

@@ -9,6 +9,9 @@ on.initialize = function()
 		Settings[App_name].definitions = get_default_map()
 	end
 	Viewport = Settings[App_name].viewport
+	-- We might have resized the window since the last time we connected to this app, so don't trust viewport dimensions
+	Viewport.w = App.screen.width
+	Viewport.h = App.screen.height
 	Definitions = Settings[App_name].definitions
 	local names = {}
 	for name, _ in pairs(Definitions) do
@@ -40,4 +43,4 @@ on.initialize = function()
 	else
 		survey_animation()  -- calls A internally
 	end
-end
+end

0132-on.resize

@@ -0,0 +1,4 @@
+on.resize = function(w, h)
+	Viewport.w = w
+	Viewort.h = h
+end