Build a Lexer based on Doctrine/Lexer

[mvriel]

As an experiment, I have built a lexer for the TypeResolver using Doctrine's Lexer library. This Lexer will create tokens out of a sting representing a type.

Net step in this experiment is to build a parser, and replace the internals of the TypeResolver class to use this lexer and parser. The goal is to come to a BC-compatible solution, which can also be used to make benchmarks to see which version runs faster and is more readable.