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Refactor datafind.find_frametype function

This PR refactors the gwpy.io.datafind.find_frametype function, which was a beastly monolith, and is now a little tamer. This also includes a few fixes for the following

  • gracefully handle failing to read the channel list (TOC) from a GWF file (RuntimeError)
  • add Virgo types to ranking system
  • some optimisations for reading cache files

This should have zero impact on users, other than hiding errors.

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