Add highlight color field option to select tool and option to sort on color

[sbaeth]

I think adding a highlight color option to the fields in the select tool would be a helpful field organization feature. Many times I am appending data/joining data, and I would like to visually separate the original fields from the appended ones, and then sort on the highlight colors chosen--and maintain these colors through the workflows. For example my raw data customer fields would be highlighted in blue: ID, First Name, Last Name, Address and my appended ones in, say, yellow: (marketing fields such as Dwelling Type, Household Composition, etc). Then it would allow to easily sort and visualize by append through the workflows.