Make use of power saving features when sat waiting for user input
Detail: s/Wimp03 - Move two key bits of power-saving logic out of repollwimp and into a new subroutine (powersave_tick) s/Wimp01, s/Wimp07 - Call powersave_tick when displaying an error box or "Press SPACE or click mouse to continue", so that CPU will drop speed and enter WFI state instead of running at full tilt. Admin: Tested on Pandaboard Fixes issue reported on forums with CPUs getting hot for no good reason: https://www.riscosopen.org/forum/forums/4/topics/3749 Version 5.51. Tagged as 'Wimp-5_51'
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