standard-directories

Retrieve the standard directories for common purposes like configuration files and data files.

This crate was primarily developed for mural-sync, but it is completely standalone and can be used in any Rust project. However, the focus of the crate will always be on supporting mural-sync's needs. Since mural-sync currently only supports Linux, standard-directories also supports Linux exclusively. Furthermore. mural-sync only requires a config directory and a data directory, so other standard directories like xdg's XDG_STATE_HOME, XDG_CACHE_HOME and XDG_RUNTIME_DIR are not supported.