[App] Switch from boost::tuple to std::tuple

It's better to use the standard lib when possible

src/App/Expression.cpp

@@ -3258,16 +3258,16 @@ static void initParser(const App::DocumentObject *owner)
     }
 }
 
-std::vector<boost::tuple<int, int, std::string> > tokenize(const std::string &str)
+std::vector<std::tuple<int, int, std::string> > tokenize(const std::string &str)
 {
     ExpressionParser::YY_BUFFER_STATE buf = ExpressionParser_scan_string(str.c_str());
-    std::vector<boost::tuple<int, int, std::string> > result;
+    std::vector<std::tuple<int, int, std::string> > result;
     int token;
 
     column = 0;
     try {
         while ( (token  = ExpressionParserlex()) != 0)
-            result.push_back(boost::make_tuple(token, ExpressionParser::last_column, yytext));
+            result.push_back(std::make_tuple(token, ExpressionParser::last_column, yytext));
     }
     catch (...) {
         // Ignore all exceptions

src/App/Expression.h

@@ -24,7 +24,7 @@
 #define EXPRESSION_H
 
 #include <string>
-#include <boost/tuple/tuple.hpp>
+#include <tuple>
 #include <Base/Exception.h>
 #include <Base/Unit.h>
 #include <App/PropertyLinks.h>

src/App/ExpressionParser.h

@@ -451,7 +451,7 @@ AppExport UnitExpression * parseUnit(const App::DocumentObject *owner, const cha
 AppExport ObjectIdentifier parsePath(const App::DocumentObject *owner, const char* buffer);
 AppExport bool isTokenAnIndentifier(const std::string & str);
 AppExport bool isTokenAUnit(const std::string & str);
-AppExport std::vector<boost::tuple<int, int, std::string> > tokenize(const std::string & str);
+AppExport std::vector<std::tuple<int, int, std::string> > tokenize(const std::string & str);
 
 /// Convenient class to mark begin of importing
 class AppExport ExpressionImporter {

src/App/PreCompiled.h

@@ -78,13 +78,13 @@
 #include <unordered_map>
 #include <iterator>
 #include <functional>
+#include <tuple>
 
 // Boost
 #include <boost_signals2.hpp>
 #include <boost/bind/bind.hpp>
 #include <boost/regex.hpp>
 
-#include <boost/tuple/tuple.hpp>
 #include <boost/utility.hpp>
 #include <boost_graph_adjacency_list.hpp>