Array Library

Working with lists of almost any sort is usually difficult in JagTag. Some very basic tools are provided with the [Arguments Library](https://github.com/jagrosh/JagTag/blob/master/src/main/java/com/jagrosh/jagtag/libraries/Arguments.java), but other than this special case, most list/array usage is done via regex.

The issue points to src/main/java/com/jagrosh/jagtag/libraries/Arguments.java and current regex-based list handling. Read Arguments.java first, then trace how array-like values are parsed; clarify the required operations and completion criteria before implementation.

Written by the indexing model from the issue text.