Transfer custom colours from board stackup to 3D viewer.

3d-viewer/3d_canvas/board_adapter.cpp

@@ -549,12 +549,19 @@ void BOARD_ADAPTER::InitSettings( REPORTER* aStatusReporter, REPORTER* aWarningR
 
         auto findColor =
                 []( const wxString& aColorName, const CUSTOM_COLORS_LIST& aColorSet )
+                {
+                    if( aColorName.StartsWith( "#" ) )
+                    {
+                        return KIGFX::COLOR4D( wxColour( aColorName ) );
+                    }
+                    else
                     {
                         for( const CUSTOM_COLOR_ITEM& color : aColorSet )
                         {
                             if( color.m_ColorName == aColorName )
                                 return color.m_Color;
                         }
+                    }
 
                     return KIGFX::COLOR4D();
                 };