Added Modix V4 machines

- Adding V4 machines
- Initial layer height set depending on nozzle diameter
- Z-hop set as 4x layer height
- V4 travel speed set to 350mm/sec

resources/extruders/modix_v3_extruder_0.def.json

@@ -3,7 +3,7 @@
   "version": 2,
   "inherits": "fdmextruder",
   "metadata": {
-    "machine": "modix_base",
+    "machine": "modix_v3_base",
     "position": "0"
   },
   "overrides": {

resources/extruders/modix_v3_extruder_1.def.json

@@ -3,7 +3,7 @@
   "version": 2,
   "inherits": "fdmextruder",
   "metadata": {
-    "machine": "modix_base",
+    "machine": "modix_v3_base",
     "position": "1"
   },
   "overrides": {
@@ -12,7 +12,6 @@
             "maximum_value": "1"
         },
         "machine_nozzle_size": { "default_value": 0.4 },
-        "material_diameter": { "default_value": 1.75 },
-		"machine_extruder_cooling_fan_number": { "default_value": 1 }
+        "material_diameter": { "default_value": 1.75 }
   }
 }

resources/extruders/modix_v4_extruder_0.def.json

@@ -0,0 +1,17 @@
+{
+  "name": "Left Extruder",
+  "version": 2,
+  "inherits": "fdmextruder",
+  "metadata": {
+    "machine": "modix_v4_base",
+    "position": "0"
+  },
+  "overrides": {
+	        "extruder_nr": {
+            "default_value": 0,
+            "maximum_value": "1"
+        }, 
+        "machine_nozzle_size": { "default_value": 0.4 },
+        "material_diameter": { "default_value": 1.75 }
+  }
+}

resources/extruders/modix_v4_extruder_1.def.json

@@ -0,0 +1,17 @@
+{
+  "name": "Right Extruder",
+  "version": 2,
+  "inherits": "fdmextruder",
+  "metadata": {
+    "machine": "modix_v4_base",
+    "position": "1"
+  },
+  "overrides": {
+	        "extruder_nr": {
+            "default_value": 1,
+            "maximum_value": "1"
+        },
+        "machine_nozzle_size": { "default_value": 0.4 },
+        "material_diameter": { "default_value": 1.75 }
+  }
+}