JS: add actions for delete, copy, paste, cut, find, and help to CellEditor
JS: add actions for delete, copy, paste, cut, find, and help to CellEditor

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

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