Bulk edit column data type.#426

We use Google Sheets for our 100 mile lap race results and wpDataTables will auto format duration columns for each lap as AM/PM time column type instead of leaving it as a string. Manually editing 50+ column data types to change from TIME to STRING and cycle through the save animation is time consuming.

It would be wonderful to be able to checkbox the columns and then set the data type for all at once instead of one-by-one.

Thank you!