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When the last task closes down have the clipboard manager task go dormant rather
than pending. Otherwise, we get stuck in a race condition wanting to start back
up again when the Task Manager's shutdown dialogue quits (Ctrl-Shift-F12 then
Ctrl-Shift-F12).

Wimp01.s:
Define symbolic names for the special values if clipboard_taskhandle for states
pending/run now/dormant.
Wimp02.s:
When the final task closes down, *now* it is safe to go to the pending state.
Wimp07.s:
Tidy up runthetask, and use Wimp version of 200 for the temporary task initialised
rather than pass an undefined R3 to Wimp_Initialise. Share a common OS_CLI tail.
CBTask.s:
When asked to quit via user message 0, set the state to dormant.

Version 5.85. Tagged as 'Wimp-5_85'