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Add a detach command to detach without terminating (#21376)

* Add a detach command to detach without terminating

Fixes #21154.

* Bump protocol version for app.detach

* Tweak to detach/quit text

* Change logPrefix to named param
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Danny Tuppeny committed
eb9c975eb093d4d581d4608fd7ad033800cc8010
Parent: 11ee2f7
Committed by GitHub <noreply@github.com> on 9/5/2018, 6:31:21 PM