remove all streams on session end, so that logging into a not created stream...

• fix that when logging into a stream of a previous editor session (without closing the editor in between) all logged data of that session is deleted and overwritten with the new logged data.
• remove all streams on session end, so that logging into a not created stream while editor is open does not accidently delete everything logged in the session before.

Source/UniversalLogging/Private/UniLogBlueprintFunctionLibrary.cpp

@@ -62,3 +62,8 @@ void UUniLogBlueprintFunctionLibrary::ModifyLogStream(const FString StreamName,
   LogStream->SetLogOnScreenOnMaster(bLogOnScreenOnMaster);
   LogStream->SetLogOnScreenOnSlaves(bLogOnScreenOnSlaves);
 }
+
+void UUniLogBlueprintFunctionLibrary::CloseLogStream(const FString StreamName)
+{
+  UniLog.CloseLogStream(StreamName);
+}
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