Allow changing roughness height statistics in GUI

Now roughness has its own collapsible form which can be further extended.

Height statistics is a separate option there.

Resolves #1016 (closed)

GUI/View/Sample/HeinzFormLayout.cpp

@@ -95,7 +95,7 @@ void HeinzFormLayout::addVector(VectorProperty& d, bool vertically /*= true*/)
 
 void HeinzFormLayout::setRowVisible(int row, bool visible)
 {
-    // Qt >=6.4 has embedded method 'QFormLayout::setRowVisible(int row, bool visible)'
+    // Qt >=6.4 has the embedded method 'QFormLayout::setRowVisible(int row, bool visible)'
     // After updating Qt on CI computers, 'HeinzFormLayout::setRowVisible' can be deleted.
     QFormLayout::itemAt(row, QFormLayout::FieldRole)->widget()->setVisible(visible);
 }