Allow generator actions to affect children

Changing the generator will often modify the underlying children's
properties.  We should store these data in the stack.  Also add the
ability to change layers

Fixes https://gitlab.com/kicad/code/kicad/-/issues/21476

(cherry picked from commit 3ec380d93c)

pcbnew/generators/pcb_tuning_pattern.cpp

@@ -25,6 +25,7 @@
 #include <pcb_generator.h>
 #include <generators_mgr.h>
 
+#include <functional>
 #include <optional>
 #include <magic_enum.hpp>
 
@@ -355,6 +356,13 @@ public:
         }
     }
 
+    void SetLayer( PCB_LAYER_ID aLayer ) override
+    {
+        PCB_GENERATOR::SetLayer( aLayer );
+
+        RunOnChildren( [aLayer]( BOARD_ITEM* item ) { item->SetLayer( aLayer ); } );
+    }
+
     const BOX2I GetBoundingBox() const override
     {
         return getOutline().BBox();

pcbnew/tools/global_edit_tool.cpp

@@ -24,6 +24,7 @@
 #include <zone_manager/dialog_zone_manager.h>
 #include <footprint.h>
 #include <pcb_track.h>
+#include <pcb_generator.h>
 #include <tool/tool_manager.h>
 #include <tools/pcb_actions.h>
 #include <tools/edit_tool.h>
@@ -171,6 +172,9 @@ int GLOBAL_EDIT_TOOL::SwapLayers( const TOOL_EVENT& aEvent )
         }
     }
 
+    for( PCB_GENERATOR* generator : frame()->GetBoard()->Generators() )
+        hasChanges |= swapBoardItem( generator, layerMap );
+
     for( BOARD_ITEM* zone : frame()->GetBoard()->Zones() )
         hasChanges |= swapBoardItem( zone, layerMap );