StagingBuff: support both Mlock & IOUring pin; Use in IoUAssmEngn

We use io_uring_register_buffers() for IoUringAssemblyEngine instead
of using mlock(). This __appears__ to have reduced CPU utilization on
the Dell laptop. Could also be that we recently upgraded total RAM
from 8GiB to 32GiB.

stimBuffApis/livoxGen1/meshStimulusBuffer.h

@@ -34,15 +34,14 @@ public:
 
 	~MeshStimulusBuffer() = default;
 
-	// Non-copyable, movable
+	// Non-copyable, non-movable: inherited pinner lifetime is instance-bound
 	MeshStimulusBuffer(const MeshStimulusBuffer&) = delete;
 	MeshStimulusBuffer& operator=(const MeshStimulusBuffer&) = delete;
-	MeshStimulusBuffer(MeshStimulusBuffer&&) = default;
-	MeshStimulusBuffer& operator=(MeshStimulusBuffer&&) = default;
+	MeshStimulusBuffer(MeshStimulusBuffer&&) = delete;
+	MeshStimulusBuffer& operator=(MeshStimulusBuffer&&) = delete;
 };
 
 } // namespace stim_buff
 } // namespace smo
 
 #endif // _LIVOX_GEN1_MESH_STIMULUS_BUFFER_H
-