Implementing uuid cache for offline usage

This won’t change online usage, because I don’t want to deal with
timestamps and name expiry yet. However it does allow for offline name
checking provided it has previously been looked up.

Note: currently doesn’t write to disk, just reads. This is because I
don’t have internet at the time of writing this and thus can’t look up
the documentation and how to write a file to disk.

I added userCachePath to directories.py, and modified the
getPlayerNameFromUUID function in version_utils.py
Removed useless #-#

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