Add setting for alternating wall directions.

This will be useful for materials that can build up a lot of stress.

part of CURA-8079

resources/definitions/fdmprinter.def.json

@@ -2907,6 +2907,16 @@
                     "enabled": "extruders_enabled_count > 1 and machine_nozzle_temp_enabled",
                     "settable_per_mesh": false,
                     "settable_per_extruder": true
+                },
+                "material_alternate_walls":
+                {
+                    "label": "Alternate Wall Directions",
+                    "description": "Alternate wall directions every other layer and inset. Useful for materials that can build up stress, like for metal printing.",
+                    "type": "bool",
+                    "default_value": false,
+                    "enabled": true,
+                    "settable_per_mesh": true,
+                    "settable_per_extruder": true
                 }
             }
         },

resources/setting_visibility/expert.cfg

@@ -133,6 +133,7 @@ support_bottom_material_flow
 prime_tower_flow
 material_flow_layer_0
 material_standby_temperature
+material_alternate_walls
 
 [speed]
 speed_print