support displaying sensor values as menu labels in drop-down

[fossfreedom]

now that we support icons lets have the ability to default the indicator to an icon and display the output of each sensor as separate menu labels when clicking the icon

Changes required. On preferences add a checkbox that says "use icon to display".

When checked - the current label line should be hidden. In its place should be a text box - every line on the text box corresponds to the menu label being displayed.

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