logging: Break out alternative logging sinks into a well defined API

First steps towards a public API for having multiple output sinks is
to allow this internally.

We give all the different log sinks the same signature, with a bool
return value to signify if stderr has been handled.

The logic of not logging to the alternative sinks when the function
qt_logging_to_console() returns true has been moved into each sink,
so that they in the future may choose to log even when also logging
to the console, allowing multi-sink output. They must then make sure
to return true if the native logging sink has also logged to stderr.

The logic of each sink has been kept the same when it comes to the
formatting of the message. Some of these sinks should ideally use
the raw message instead of the formatted one, as they are structured
logging sinks.

Change-Id: I441d3bc1db3e16180704e00d13a40564b6f06a6c
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

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