Added AdifEnumerations.xml file that contains Ant_Path and
Arrl_Section enumerations. Added AdifEnumerations class to interface
with AdifEnumerations.xml.
Modified EnumerationField class to be a base class that will be
the parent of EnumerationValue and future classes.
Added EnumerationValue, Ant_Path and Arrl_Sect classes.
Added many test classes for testing ADIF field classes.