Usages of View Port and DataTable need to be clearly separated

[naleeha]

Discussed in #1368

Support hidding some columns by specifying subset of the table columns in view port def function
& filter on display values (i.e. view port data)

Tasks

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1. Support hidden column by specifying subset of table columns in view port def columns #1415
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2. Review all the different way to get row data and simplify the api #1468
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3. Use view port columns in type ahead rather than table columns #1434
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4. Review usages of getting row data and ensure ViewPort data vs Table data is used in correct cases

[naleeha]

done, moving 1468 to backlog to be tackled another time