GitLab

Details:
>
> I was just fiddling with Taskwindow, and realising one of the big things
> slowing it down is that it polls everytime its internal buffer gets filled.
> If it just lets the Wimp do the queueing it goes quite a lot faster!
>
> It only polls the wimp once every 10 buffer fulls of data, so is pretty
> nippy, but doesn't stall when doing a lot of text output in SVC mode.
>
> It also assembles to use TickerV instead of VSync (unless you unset the
> flag).
>
Admin:
  Tested on Ursula RiscPC and STB without any problems.

Version 0.68. Tagged as 'TaskWindow-0_68'