higher opengl version (4.3)

src/GLWidget.cpp

@@ -103,7 +103,7 @@ bool GLWidget::AnyDialogOpen() {
 void GLWidget::uploadStaticDataToGPU() {
 	auto pendula = &simulation->pendula;
 
-	int pointCount = std::transform_reduce(pendula->begin(), pendula->end(), 0, [](int prev, int curr){
+	size_t pointCount = std::transform_reduce(pendula->begin(), pendula->end(), 0, [](size_t prev, size_t curr){
 		return prev + curr + 1;
 	}, [](const Pendulum * p){
 		return p->X.size();