Converted the last remaining sprintf to snprintf
These changes are more invasive than my previous conversions. a) Some private/protected method signatures now take a size parameter. b) Deleted vtkMPEG2Writer entirely, because 1) it uses sprintf and I can’t find the size of the buffer, I think it’s been removed. 2) The class hasn’t been built in years. c) some new defines introduced to avoid copy-pasting magic numbers. The only remaining sprintf, I think, are in third party or C code.
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