Mesh cache improvements

vtkDataObjectMeshCache has better performance to forward attribute to output:

• PreservedInputAttributes flags a field from the OriginalDataObject so its arrays are shallow copied, without the need of the (time-costly) OriginalIds mapping.

• when using the OriginalIds map, the cache now uses SMP acceleration to forward attributes to the output.

• PreservedCachedArray flags some arrays from the cache to be preserved as is in the output. By default, every cached arrays are removed and the output is filled only by forwarding input arrays. When the consumer adds a new array that will not change in static mesh cases, it is useful to set it as a PreservedCachedArray.

vtkMeshCacheRunner is a RAII helper to use an existing vtkDataObjectMeshCache with a new OriginalDataObject. Its constructor does some sanity checks, can add implicit OriginalIds if needed and copy the cache to the given output if the cache is valid. Optionally performs cache update in its destructor.

Fix for composite data

vtkDataObjectMeshCache stores the MeshMTime for each input leaf. Previously, only the most recent (i.e. the greater) was stored for comparison. This was a wrong approach: replacing an older leaf with another dataset also older than the stored value, the cache was still considered as valid.