Add hypothetical multiextrusion printer to test

resources/definitions/hypothetical_multi.def.json

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+{
+    "id": "hypothetical_multi",
+    "version": 2,
+    "name": "Hypothetical Multiextrusion printer",
+    "inherits": "fdmprinter",
+    "metadata": {
+        "author": "fieldOfView",
+        "manufacturer": "fieldOfView",
+        "category": "fieldOfView",
+        "visible": true,
+        "file_formats": "text/x-gcode",
+        "machine_extruder_trains":
+        {
+            "0": "hypothetical_multi_extruder_1",
+            "1": "hypothetical_multi_extruder_2",
+            "2": "hypothetical_multi_extruder_3",
+            "3": "hypothetical_multi_extruder_4"
+        },
+        "preferred_material": "*pla*",
+        "preferred_quality": "*normal*",
+        "has_variants": true,
+        "has_materials": true
+    },
+
+
+
+    "overrides": {
+        "machine_width": { "default_value": 220 },
+        "machine_depth": { "default_value": 215 },
+        "machine_height": { "default_value": 200 },
+        "machine_heated_bed": { "default_value": true },
+        "machine_show_variants": { "default_value": true },
+        "machine_extruder_count": { "default_value": 4 }
+    }
+}

resources/extruders/hypothetical_multi_extruder_1.def.json

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+{
+    "id": "hypothetical_multi_extruder_1",
+    "version": 2,
+    "name": "1st Extruder",
+    "inherits": "fdmextruder",
+    "metadata": {
+        "machine": "hypothetical_multi",
+        "position": "0"
+    },
+
+    "overrides": {
+        "extruder_nr": {
+            "default_value": 0,
+            "maximum_value": "3"
+        },
+        "machine_nozzle_offset_x": { "default_value": 0.0 },
+        "machine_nozzle_offset_y": { "default_value": 0.0 }
+    }
+}

resources/extruders/hypothetical_multi_extruder_2.def.json

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+{
+    "id": "hypothetical_multi_extruder_2",
+    "version": 2,
+    "name": "2nd Extruder",
+    "inherits": "fdmextruder",
+    "metadata": {
+        "machine": "hypothetical_multi",
+        "position": "1"
+    },
+
+    "overrides": {
+        "extruder_nr": {
+            "default_value": 1,
+            "maximum_value": "3"
+        },
+        "machine_nozzle_offset_x": { "default_value": 18.0 },
+        "machine_nozzle_offset_y": { "default_value": 0.0 }
+    }
+}

resources/extruders/hypothetical_multi_extruder_3.def.json

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+{
+    "id": "hypothetical_multi_extruder_3",
+    "version": 2,
+    "name": "3rd Extruder",
+    "inherits": "fdmextruder",
+    "metadata": {
+        "machine": "hypothetical_multi",
+        "position": "2"
+    },
+
+    "overrides": {
+        "extruder_nr": {
+            "default_value": 2,
+            "maximum_value": "3"
+        },
+        "machine_nozzle_offset_x": { "default_value": 0.0 },
+        "machine_nozzle_offset_y": { "default_value": 18.0 }
+    }
+}

resources/extruders/hypothetical_multi_extruder_4.def.json

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+{
+    "id": "hypothetical_multi_extruder_4",
+    "version": 2, 
+    "name": "4th Extruder",
+    "inherits": "fdmextruder",
+    "metadata": {
+        "machine": "hypothetical_multi",
+        "position": "3"
+    },
+
+    "overrides": {
+        "extruder_nr": {
+            "default_value": 3,
+            "maximum_value": "3"
+        },
+        "machine_nozzle_offset_x": { "default_value": 18.0 },
+        "machine_nozzle_offset_y": { "default_value": 18.0 }
+    }
+}

resources/variants/hypothetical_multi_0.4.inst.cfg

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+[general]
+name = 0.4 mm
+version = 2
+definition = hypothetical_multi
+
+[metadata]
+author = fieldOfView
+type = variant
+
+[values]
+machine_nozzle_size = 0.4

resources/variants/hypothetical_multi_0.6.inst.cfg

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+[general]
+name = 0.6 mm
+version = 2
+definition = hypothetical_multi
+
+[metadata]
+author = fieldOfView
+type = variant
+
+[values]
+machine_nozzle_size = 0.6