QMessagePattern: replace manual memory handling with std::unique_ptr

Dealing with 'tokens' is straight-forward.

With 'literals', it is not quite so straight-forward, because the
ownership chain here is two levels deep. But it's still worthwhile,
because it replaces quite error-prone code with code which may be a
bit more verbose, but is totally safe.

As a drive-by, moved initialization of the fromEnvironment member to
the body of the ctor in order to avoid code-churn (I needed to touch
the ctor-init-list anyway).

The QMessagePattern dtor is now empty and consequently defaulted.

Change-Id: Iadb25e7aba1c5a94fd9068be7ae03f17e975328b
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
 
 
 
 
 
 
 

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