add basic window system

bordered_window.lua

@@ -15,3 +15,5 @@ function w.new(inner, x, y, w, h)
     local r = window.new(a, x, y, h, w)
     return r
 end
+
+return w

window.lua

@@ -22,7 +22,7 @@ function w.new(inner, x, y, w, h)
 
     function r:draw()
         love.graphics.push()
-        love.graphics.setTransform(self.transform)
+        love.graphics.applyTransform(self.transform)
         inner:draw()
         love.graphics.pop()
     end