Add various classes which facilitate generating tables in text-based applications.

This includes a generic API for constructing the table (TableBuilder) and three "table printers":

* TextTablePrinter: a pretty human-readable table that supports configurable padding, column sizes, separators, etc

* CSVTablePrinter: a table printer that outputs in CSV format (useful for spreadsheet imports)

* TabSeparatedTablePrinter: a table printer which uses tabs as field delimiters (e.g. useful for unix cut command)