itions.</li>
  <li><code>control</code>: additional pseudo control structures.</li>
  <li><code>collection</code>: collection add-ons (infinite iterators, random selection, ...)</li>
  <li><code>io</code>: read/write text files, access resources.</li>
  <li><code>text</code>: text formatting, including thread/time information.</li>
  <li><code>threads</code>: concurrency stuff.</li>
  <li><code>timing</code>: timers, delayers, elapsed time calculation.</li>
  <li><code>util</code>: utility functions, fast r