Arrays and lists only contain WORD tokens.
Added basic package structure and classes for interpreter.
Renamed entry point of the grammar.
Moved parser classes in their own package.
Added ‘make’ and ‘print’ procedures.
Added value node.
Implemented basic infix expressions.
Simplified Value and infix expressions.
Added relational- and equality expressions.
Refactored BinaryExpressionNode, added functionality to accept optional
minus in string Value, added some unit tests.
Added unary node.
Added list and array types.
Added manual from UCB Logo site. Added n-value procedure calls.
Added THING procedure, let Scope#resolve(String) throw an exception
when a variable is not defined.
Added ITEM procedure, introduced Collection interface for array and
list types.