py/makeqstrdefs: Cleanup and extend source file classification.

- The classification of source files in makeqstrdefs.py has been moved into
  functions to consolidate the logic for that classification into a single
  place.
- Classification of source files (into C or C++ or "other" files) is based
  on the filename extension.
- For C++ there are many more common filename extensions than just ".cpp";
  see "Options Controlling the Kind of Output" in man gcc for example.  All
  common extensions for C++ source files which need preprocessing have been
  added.

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