openString function
Reads the contents of the path
file as String.
If files doesn't exists, returns empty String.
Implementation
String openString(String path) {
// if (useDataDir && !path.startsWith('data/')) {
// path = 'data/master/$path';
// }
var f = File(path);
if (f.existsSync()) return f.readAsStringSync();
print('openString(): ${f.uri} does not exists.');
return '';
}