Create a lexer that tokenizes input. Input files are read and split based on grammar rules for the Datalog language.
Terminals are specified in the enum TokenType in the Token.h file. Tokens are added to a vector which can be handed
off to the parser object.
Takes a vector of tokens as input and performs 2 high-level functions. First, it checks for syntax correctness using a recursive descent parser (for an LL(1) grammar). If syntax is incorrect, errors will be thrown indicating the tokenType, tokenValue, and lineNumber that caused the error. Second, it creates a Datalog object based to be used by future components.