Map and Byte Vector Enhancements

0.3.3 (2019-11-06)

• Feature: If a string or byte vector is called with a function as first
  argument, the function is called for each character or byte.
• Feature: You can iterate and map over a map now by calling it with a
  function as first argument.
• Change: If a string is called with index/len, and it's outside the range,
  an empty string is returned and not $none.
• Bugfix: Fixed std:displayln space placement and emitting empty lines with
  no parameters.