Updated core binding to align with CybOX 2.1. Removed parseLiteral and exportLiteral* functions. Resolves #140
Updated common binding to align with CybOX 2.1. Removed all parseLiteral and exportLiteral functions. Removed member_data_items dicts from classes in common. Resolves #141
Removed member_data_items dicts from classes.
Removed item from GDSClassesMapping which no longer exists
Removed member_data_items dicts from core and common bindings