* update steamclient loader script for Linux to avoid showing help page when no args are provided
* update steamclient loader script for Linux to look for steamclient lib in subfolders, to avoid having to rename each lib
* changed the environment variable `SteamAppPath` to `GseAppPath`
* allow loading `config.ini` from global settings path + merge it with the local one, and allow the local one to override the global one
* fixed the path returned by `get_user_appdata_path()` to include the path separator
* updated readmes