fixed assembly cache format

My first attempt at an assembly cache was a dictionary from a
Python filename to its associated assembly... except each templated
class in the file gets its own assembly.

This new format (which has different magic numbers) provides a
dictionary from a Python filename to a *list* of its associated
assemblies. This also means that the cache can remember Python
files with no associated assemblies so that they don't get scanned
again.

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