JS: convert the "Add Label" entry in the context menu to a "Show Label" check box
JS: convert the "Add Label" entry in the context menu to a "Show Label" check box

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

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