Revert "Now using ByteArray in CSVParser.createCSV() for 2x speedup."

This reverts commit 721aaba8b1b70953a764dabf3dc743372a206d84.
Revert "Added StandardLib.join, a faster alternative to Array.join()."

This reverts commit 296a180b5d3b53f567d31382c899a6704c75ecb8.