Fix polygon point editor behavior to avoid hard limits

When dragging a vertex, use the 45/90 limits as guides and display the
full guidelines.  When dragging a midpoint, do not use these limits.
Keep the standard converging limit

common/tool/construction_manager.cpp

@@ -681,7 +681,7 @@ void SNAP_MANAGER::UpdateSnapGuides()
 
             if( activeDirection && *activeDirection == static_cast<int>( ii ) )
             {
-                guide.LineWidth = 2;
+                guide.LineWidth = 5;
                 guide.Color = m_snapGuideHighlightColor;
             }
             else