app_cache_dir           Path to an App Cache Directory
construct_cached_file_path
                        Construct Cache Path
construct_processed_filename
                        Construct Processed Filename
maybe_cache             Cache a File if Necessary
maybe_process           Process a File if Necessary
read_or_cache           Read or Cache a File
read_or_process         Read or Process a File
set_app_cache_dir       Set a Cache Directory for an App
