Initial setup for saving game states

(code may or may not compile at this point)

osx/tools/fileio.h

@@ -27,3 +27,5 @@ std::vector<std::string> load_strings(std::string which);
 
 bool load_party(fs::path file_to_load);
 bool save_party(fs::path dest_file);
+
+void init_directories();