Columns enhancements

[jjgrainger]

• Remove Columns order method and replace with position
• Update Columns methods to better match functions
• Update Columns ordering logic
• Add ColumnBuilder to create/modify columns with a fluent API
• Add add/modify methods to Columns to initiate ColumnBuilder
• Remove integration methods inside Columns and replace with getters
• Update Column populate and sort methods to return callbacks to remove integration coupling