add draw/update stat readout

surprisingly, update is most of my problem

vacuum_gambit.p8

@@ -199,6 +199,7 @@ end
 
 function _update60()
  mode:update()
+ ustat = stat(1)
 end
 
 function ones(n)
@@ -295,6 +296,8 @@ end
 
 function _draw()
  mode:draw()
+ local ds = stat(1)
+ print(tostr(ustat).." + "..tostr(ds-ustat), 0, 122, 7)
 end
 
 function drawgame_top()