update Snapmaker profiles

- add Breakaway Support filament
- add preheat params for Snapmaker Dual/IDEX printers
- update the check bounds code in start-gcode, which is now off by default

resources/profiles/Snapmaker/filament/fdm_filament_breakaway.json

@@ -0,0 +1,49 @@
+{
+  "type": "filament",
+  "from": "system",
+  "instantiation": "false",
+  "name": "fdm_filament_breakaway",
+  "inherits": "fdm_filament_common",
+  "hot_plate_temp": [
+    "65"
+  ],
+  "hot_plate_temp_initial_layer": [
+    "70"
+  ],
+  "filament_flow_ratio": [
+    "0.98"
+  ],
+  "filament_cost": [
+    "100"
+  ],
+  "filament_density": [
+    "1.32"
+  ],
+  "filament_max_volumetric_speed": [
+    "12"
+  ],
+  "filament_retraction_length": [
+    "1.8"
+  ],
+  "nozzle_temperature_initial_layer": [
+    "230"
+  ],
+  "nozzle_temperature": [
+    "220"
+  ],
+  "temperature_vitrification": [
+    "154"
+  ],
+  "default_filament_colour": [
+    "#ffffff"
+  ],
+  "filament_type": [
+    "Breakaway Support"
+  ],
+  "nozzle_temperature_range_high": [
+    "240"
+  ],
+  "nozzle_temperature_range_low": [
+    "200"
+  ]
+}