getExternalAssetsPath method of the EngineSettings interface
Returns the path to the custom directory with the necessary resources.
The program will search for any resource file it needs first in assets, then in the specified custom folder, each time looking in the corresponding subfolder. For example, it will try to locate a pattern file (*.rom) like this:
in <custom search path>/patterns
if the file is not found, an error will be returned
The method returns the full path to the custom resource files folder.