finding user-specific application data directories

This package contains a small library for building suitable paths for storing and locating application-specific, user-specific configuration files, data files, and cache files.

The library is based on similar principles as the XDG specification, namely:

 - There are one or more directories to search for configuration files,
   one of which is preferred and used for creating new configuration
   files.
 - There are one or more directories to search for data files, one of
   which is preferred and used for creating new data files.
 - There is exactly one cache directory, which can be used for transient
   files that the application is able to recreate if lost.

The exact locations of these directories will depend on operating system and system configuration.

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