[RFC] 03/10 Add non-stop global

[Pedro Alves]

This patch adds a non_stop global and associated set/show non-stop commands.

It is very simplistic and doesn't have any target support checks.  we still
haven't decided on how to do those, and how to report this to the frontends.
Plus, it will need docs.

But, the rest of the series depends on the global, so here it is.

-- 
Pedro Alves
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