view .arcconfig @ 46388:d8ad391e10f5

command-namespace: use `::` are the command separator

This was discussed on the mailing list / phab and `::` got a couple of positive
feedback.

I dediced to not introduce automatic folding of `::`, I feel like it make sense
for `-`, but I like the expliciteness of `::`.

So I am adding alias for backward compatibility.

Differential Revision: https://phab.mercurial-scm.org/D9872

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