Added token class

Also added a couple of foward declarations for faster compiles

common/Lexer.h

@@ -1,9 +1,24 @@
 #pragma once
 
-#include <fstream>
 #include <vector>
 #include <string>
 
+// Foward declarations of STD classes to minimise includes //
+namespace std
+{
+	template<typename T1 = char>
+	struct char_traits;
+
+	template<typename T1, typename T2>
+	class basic_ifstream;
+
+	template<typename T1, typename T2>
+	class basic_ofstream;
+
+	using ifstream = basic_ifstream<char, char_traits<char>>;
+	using ofstream = basic_ofstream<char, char_traits<char>>;
+}
+
 // This file contains everything that is exported from Lexer.lib
 // The rest of the items within the Lexer project are internal only