definition adjustments

- If the machine has two extruder trains, they should be defined individually rather than reused from another machine, creates unnecessary linkage between machines.
- Added "has_textured_buildplate"

resources/definitions/biqu_b2.def.json

@@ -6,8 +6,9 @@
     {
         "visible": true,
         "author": "Boris Juraga",
+        "has_textured_buildplate": true,
         "machine_extruder_trains": {
-            "0": "biqu_base_extruder_0",
+            "0": "biqu_b2_extruder_0",
             "1": "biqu_b2_extruder_1"
         },
         "quality_definition": "biqu_b2"

resources/extruders/biqu_b2_extruder_0.def.json

@@ -0,0 +1,16 @@
+{
+    "version": 2,
+    "name": "Extruder 1",
+    "inherits": "fdmextruder",
+    "metadata":
+    {
+        "machine": "biqu_b2",
+        "position": "0"
+    },
+    "overrides":
+    {
+        "extruder_nr": { "default_value": 0 },
+        "machine_nozzle_size": { "default_value": 0.4 },
+        "material_diameter": { "default_value": 1.75 }
+    }
+}