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d1439a1fa9
This moves the scan thread logic and variables into a separate ScanThread class. By turning ScanThread instances into members of the most derived class, this ensures that the scan thread is always properly stopped when the most derived class is destructed and fixes a race condition that could cause the scan thread to call virtual member functions from a derived class whose members have already been destructed. A drawback of this approach is that the scan thread must be the last member variable, so this commit also adds static assertions to ensure that the assumption stays valid.