Create the "FusionInventory Agent" folder under the Start Menu.

This commit references #2206.
Add new options 'start-menu' and 'no-start-menu'.

This commit references #2206.
Get current config of the 'no-start-menu' option.

This commit references #2206.
Integrate the 'no-start-menu' option with GUI.

This commit references #2206.
Create entries for the 'no-start-menu' and 'start-menu' options in the help.

This commit closes #2206.