JS: add javadoc and cosmetic changes to 'readStream' for InputAgent
JS: add javadoc and cosmetic changes to 'readStream' for InputAgent

The arguments were renamed to be consistent with 'getFileURI'.

Signed-off-by: Harry King <409587b9e6671aa0763646191d292852dc49a658@gmail.com>

jaamsim/jaamsim,jaamsim/jaamsim,jaamsim/jaamsim,jaamsim/jaamsim