Remove std::bind usages from Code/Editor (#3358)

A few small modernizations as well ( override )

Signed-off-by: nemerle <96597+nemerle@users.noreply.github.com>

Code/Editor/Controls/ReflectedPropertyControl/PropertyMiscCtrl.cpp

@@ -145,7 +145,7 @@ bool UserPopupWidgetHandler::ReadValuesIntoGUI(size_t index, UserPropertyEditor*
 QWidget* FloatCurveHandler::CreateGUI(QWidget *pParent)
 {
     CSplineCtrl *cSpline = new CSplineCtrl(pParent);
-    cSpline->SetUpdateCallback(AZStd::bind(&FloatCurveHandler::OnSplineChange, this, AZStd::placeholders::_1));
+    cSpline->SetUpdateCallback([this](CSplineCtrl* spl) { OnSplineChange(spl); });
     cSpline->SetTimeRange(0, 1);
     cSpline->SetValueRange(0, 1);
     cSpline->SetGrid(12, 12);