Added __version__ and changed file_data_contains() to examine the passed-in data to determine whether or not it is *.mdl file data (by looking at its leading 4-byte magic number), rather than relying on the caller to pass in that information.
Added __version__ and changed file_data_contains() to examine the passed-in data to determine whether or not it is *.mdl file data (by looking at its leading 4-byte magic number), rather than relying on the caller to pass in that information.

darthryking/HTAPT