complete lazy loading of py modules to use to a reduced set of pythons modules, gives ~40% speedup on cold & warm start (without netrender).

- use own OrderedDictMini class, pythons collections.OrderedDict is overkill, 179 sloc. replaced with own, 11 lines.
- remove code which stored the class file & line per RNA subclass, this was useful but would raise its own exception every time to generate a stack trace to get the class info so we could use of the class failed to register. the class stores its module & name which can be enough to find where it was defined.

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