[Base] Remove includes to StdStlTools.h as that's not needed anymore

std::make_unique was introduced in c++14, so no need to use the back
ported version

src/Base/UnitsApi.cpp

@@ -26,6 +26,7 @@
 # include <unistd.h>
 #endif
 
+#include <memory>
 #include <QString>
 #include "Exception.h"
 #include "UnitsApi.h"
@@ -35,7 +36,6 @@
 #include "UnitsSchemaCentimeters.h"
 #include "UnitsSchemaMmMin.h"
 #include "UnitsSchemaFemMilliMeterNewton.h"
-#include "StdStlTools.h"
 
 #ifndef M_PI
 #define M_PI       3.14159265358979323846

src/Mod/Part/App/GeometryExtension.h

@@ -24,7 +24,6 @@
 #ifndef PART_GEOMETRYEXTENSION_H
 #define PART_GEOMETRYEXTENSION_H
 
-#include <Base/StdStlTools.h>
 #include <Base/Persistence.h>
 #include <memory>
 #include <string>

src/Mod/Sketcher/App/SketchObjectPyImp.cpp

@@ -27,8 +27,6 @@
 # include <memory>
 #endif
 
-#include <Base/StdStlTools.h>
-
 #include <Mod/Sketcher/App/SketchObject.h>
 #include <Mod/Part/App/LinePy.h>
 #include <Mod/Part/App/Geometry.h>

src/Mod/Spreadsheet/App/Cell.cpp

@@ -38,7 +38,6 @@
 #include <Base/UnitsApi.h>
 #include <Base/Writer.h>
 #include <Base/Console.h>
-#include <Base/StdStlTools.h>
 #include <App/ExpressionParser.h>
 #include "Sheet.h"
 #include <iomanip>