cmake: src directory has been added to include path
private headers: internal_statistics header has been removed
private headers: internal_metrics headers have been moved to src/ directory
private headers: message_queue header has been removed
private headers: events headers have been moved to src/ directory
private headers: chrono header moved back to public interface
private headers: math_utils header has been moved back to public interface
private headers: accumulators cumulative header has been removed