JS: add 'Copy', 'Paste', and 'Delete' to the Edit menu
JS: add 'Copy', 'Paste', and 'Delete' to the Edit menu

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

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