Added notes option to worker interface

[arjunrajlab]

You can now have a notes field like this:

'Notes on using connect sequential': {
            'type': 'notes',
            'value': 'This tool connects objects sequentially across time or z-slices.'
                     'It is useful for connecting objects that are moving or changing over time or z-slices.'
        },

[pchoisel]

This looks like a great modification, but there is a lot of redundant code.
A quick and easy way to fix it would be to use the new v-tooltip directive from https://github.com/Kitware/UPennContrast/pull/804
Since we have control of the actual tooltip, we could add a new prop to the NimbusTooltip component to display it or not, which would make this feature much shorter.
Tell me if you want me to edit this MR