Appends a new menu item at the end of this menu
| itemText | string | text f new item | 
| command | string | command to execute when menu item selected | 
| helpString | optional string | help string to be displayed in status bar when cursor hovers over menu item | 
| sessionFile | optional boolean | Default true. Should commands appear in session file when item selected? | 
| Return value | none | 
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