Use std::unique_ptr for PIMPL
Many classes in the rendering library used std::shared_ptr for PIMPL. They could and should be changed to use std::unique_ptr since the PIMPL are supposed to be owned by multiple instances.
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Many classes in the rendering library used std::shared_ptr for PIMPL. They could and should be changed to use std::unique_ptr since the PIMPL are supposed to be owned by multiple instances.