add color fade to text box, default to intended semantic text palette

vacation.p8

@@ -305,19 +305,28 @@ end
 -- text rendering
 
 -- text colors for zonk mode:
---  8 -- standard
---  9 -- delayed fade
--- 10 -- currently fading in
 txtbox = {
  x=0,
  y=0,
- text="???",
- col=8,
+ cols={14, 10, 9, 8},
+ f=0,
+ interval=4,
  mode=0x81,
 }
-mknew(txtbox)
+mknew(txtbox, function(self)
+ if (not self.cols) self.cols = {14,10,9,8}
+ self.c = deli(self.cols)
+end)
 
-function txtbox:update() end
+function txtbox:update()
+ if #self.cols > 0 then
+  self.f += 1
+  if self.f >= self.interval then
+   self.f = 0
+   self.col = deli(self.cols)
+  end
+ end
+end
 
 function txtbox:draw()
  poke(0x5f58, self.mode)