support FileDialog::Mode::OPEN_DIR for selecting a directory #4272
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add OPEN_DIR besides OPEN and SAVE for FileDialog mode definition to select a directory in cpp as long as python.
Currently OPEN and SAVE mode of FileDialog select a file path like /path/to/file.json, there is no way to select a directory path like /path/to/dir/path. OPEN_DIR mode is used to select an existing directory path.
This change is