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Change-Id: Ia6fef10bc577f9722b6c063c2df4d1651a8be50d
Reviewed-by: Christian Stenger <christian.stenger@theqtcompany.com>

Change-Id: I56ba8f9d0d4abe7627f9dd0d980774dda814d456
Reviewed-by: Christian Stenger <christian.stenger@theqtcompany.com>

This takes especially configurations in account when subprojects
are enabled/disabled conditionally.

This had lead to crashes when executing projects with some more
tests or more test output. Now it's using a mutex to avoid
concurrent access.

Instead just remove these from the current test run and add a
respective warning to the test results pane.

Additionally made a the message of having no test cases at all
a warning instead of a fatal.

Additionally preparation of filtering has been done.

...and display fatal messages on the summary as well.

No need for having this more complicated than necessary.

If there are items inside the results pane that match the filter
item filtering for these kind of results will be enabled.

Additionally
* fixed some deletion of pointers
* const correctness
* small refactorings for readability
* better separation of responsibilities