Method newSplMenuItem

新建集算器菜单项 @param cmdId 在GCSpl中定义的命令 @param menuId 在GCSpl中定义的菜单名 @param mneKey The Mnemonic @param mask int, Because ActionEvent.META_MASK is almost not used. This key seems to be only available on Macintosh keyboards. It is used here

(short cmdId, String menuId, char mneKey,
			int mask)