Implement Z Hop Speed

Z Hops have their own speeds now. It no longer uses the maximum feedrate, which was unknown for some printers and therefore limited only to light speed, which was too much for some printers to handle.

Implements CURA-6532.

resources/definitions/fdmprinter.def.json

@@ -2784,6 +2784,19 @@
                     "settable_per_extruder": true,
                     "limit_to_extruder": "adhesion_extruder_nr"
                 },
+                "speed_z_hop":
+                {
+                    "label": "Z Hop Speed",
+                    "description": "The speed at which the vertical Z movement is made for Z Hops. This is typically lower than the print speed since the build plate or machine's gantry is harder to move.",
+                    "unit": "mm/s",
+                    "type": "float",
+                    "default_value": 10,
+                    "minimum_value": "0",
+                    "maximum_value": "machine_max_feedrate_z",
+                    "enabled": "retraction_enable and retraction_hop_enabled",
+                    "settable_per_mesh": false,
+                    "settable_per_extruder": true
+                },
                 "max_feedrate_z_override":
                 {
                     "label": "Maximum Z Speed",