Command prompt executor

This component runs a specified command line in a given working directory using the local command line processor.

It follows an example on executing shell commands via a Java Snippet Node at [Shell Command in knime](https://forum.knime.com/t/shell-command-in-knime/6709/12) (discussed in 2014). I needed to build it to get functionality equivalent to KNIME NGS tools "Bash Node", which is not available after release of KNIME Analytics Platform version 4.7. Documentation from [Class ProcessBuilder](https://docs.oracle.com/javase/7/docs/api/java/lang/ProcessBuilder.html) was enlighting.

Output ports

1. Type: Table
   Results
   The process's resulting standard output and exit code.
2. Type: Table
   Error Message
   The process's error message and exit code.