profiler: Centralise output responsibility from ProfilerOutputText to Profiler

profiler: Centralise output responsibility from ProfilerOutputText to Profiler

Make it Profiler.php's responsibility to enforce this, based on the
existing signal from ProfilerOutput::logsToOutput().

The ProfilerOutputText class should not have to double-check this
a second time.

Long-term, I'd like even this check in Profiler::logDataPageOutputOnly
to be removed, because really the external caller of that should
know whether it is safe to output stuff or not rather than stashing
its own state inside Profiler::$allowOutput and then implicitly
reading it back out again later on. But, that's for another time.

Also:
* Remove use of deprecated Profiler::setTemplated while at it.
* Make 'visible' parameter explicit, as for other parameters.

Change-Id: Iaa3fc4ea25a059b90235d769db60c04b8f152f05