[Issue 2447] There's no disconnectall for std.signals

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=2447
Issue 2447 depends on issue 9347, which changed state.

Issue 9347 Summary: new std.signals2 implementation
https://issues.dlang.org/show_bug.cgi?id=9347

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

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