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787bee375c
- Replace legacy Standard_Mutex usage across many modules with std::mutex. - Include <mutex> where needed and remove <Standard_Mutex.hxx> includes. - Replace Standard_Mutex::Sentry / explicit Lock/Unlock with std::lock_guard or std::unique_lock. - Convert optional/heap mutex holders to std::unique_ptr<std::mutex> and adapt locking accordingly. - Simplify several singleton initializations (remove manual double-checked locking where safe). - Use thread_local for per-thread flags instead of ad-hoc mutex protection. - Fix BVH_BuildQueue Fetch logic to preserve thread counters and wasBusy handling. - Remove obsolete TopTools_MutexForShapeProvider sources and update FILES.cmake. This modernizes mutex usage, reduces dependency on custom mutex types and improves clarity of locking patterns.