Merge "gd/parser: Separate code requires block in yacc"

%{

%code requires {

  #include <iostream>

  #include <vector>

  #include <list>

  #include "declarations.h"

  #include "logging.h"

  #include "language_y.h"

  #include "field_list.h"

  #include "fields/all_fields.h"

}

%{

  #include "language_y.h"

  extern int yylex(yy::parser::semantic_type*, yy::parser::location_type*, void *);

  ParseLocation toParseLocation(yy::parser::location_type loc) {