Function appDataPath
Returns application data directory.
string appDataPath
(
string subdir = null
);
On unix, it will return path to subdirectory in home directory - e.g. /home/user/.subdir if ".subdir" is passed as a parameter.
On windows, it will return path to subdir in APPDATA directory - e.g. C:\Users\User\AppData\Roaming\.subdir.