CURA-4481 add setting Remove Empty First Layers

plugins/CuraEngineBackend/ProcessSlicedLayersJob.py

@@ -240,3 +240,4 @@ class ProcessSlicedLayersJob(Job):
             else:
                 if self._progress_message:
                     self._progress_message.hide()
+

resources/definitions/fdmprinter.def.json

@@ -3956,6 +3956,15 @@
                     "limit_to_extruder": "support_infill_extruder_nr",
                     "enabled": "support_enable and support_use_towers",
                     "settable_per_mesh": true
+                },
+                "remove_empty_first_layers":
+                {
+                    "label": "Remove Empty First Layers",
+                    "description": "Remove empty layers beneath the first printed layer if they are present.",
+                    "type": "bool",
+                    "default_value": true,
+                    "settable_per_mesh": false,
+                    "settable_per_extruder": false
                 }
             }
         },