Operand interpretation halfway complete

Individual operand tokens are now being converted to doubles. Now some
sort of DFA needs to be created to link groups of these values together
to form something a single operand.
Still working on evaluation of operands

Creating a DFA to process grouped operands
Beginning calculation implementation

All of DigitDFA logic is implemented except for greater_than_tens
(hundreds, thousands etc). Trying to figure out if I can use Java’s
inherent order of operations rather than having to manually implement
it myself.