Replace STL meshes with 3MF files

These are much smaller than their STL counterparts. This saves on download and installation time. Maybe also on loading time.

resources/definitions/101Hero.def.json

@@ -7,7 +7,7 @@
         "author": "rikky",
         "manufacturer": "101Hero",
         "file_formats": "text/x-gcode",
-        "platform": "101hero-platform.stl",
+        "platform": "101hero-platform.3mf",
         "supports_usb_connection": true,
         "preferred_quality_type": "draft",
         "machine_extruder_trains":

resources/definitions/3dator.def.json

@@ -8,7 +8,7 @@
         "manufacturer": "3Dator GmbH",
         "file_formats": "text/x-gcode",
         "supports_usb_connection": true,
-        "platform": "3dator_platform.stl",
+        "platform": "3dator_platform.3mf",
         "machine_extruder_trains":
         {
             "0": "3dator_extruder_0"

resources/definitions/3dtech_semi_professional.def.json

@@ -7,7 +7,7 @@
         "author": "3DTech",
         "manufacturer": "3DTech",
         "file_formats": "text/x-gcode",
-        "platform": "3dtech_semi_professional_platform.stl",
+        "platform": "3dtech_semi_professional_platform.3mf",
         "platform_offset": [0, -2.5, 0 ],
         "machine_extruder_trains":
         {

resources/definitions/anycubic_4max.def.json

@@ -10,7 +10,7 @@
         "category": "Other",
         "file_formats": "text/x-gcode",
         "icon": "icon_ultimaker2",
-        "platform": "anycubic_4max_platform.stl",
+        "platform": "anycubic_4max_platform.3mf",
         "has_materials": true,
         "quality_definition": "anycubic_4max",
         "has_machine_quality": true,

resources/definitions/anycubic_i3_mega.def.json

@@ -8,7 +8,7 @@
         "author": "TheTobby",
         "manufacturer": "Anycubic",
         "file_formats": "text/x-gcode",
-        "platform": "anycubic_i3_mega_platform.stl",
+        "platform": "anycubic_i3_mega_platform.3mf",
         "has_materials": true,
         "has_machine_quality": true,
         "preferred_quality_type": "normal",

resources/definitions/beamup_s.def.json

@@ -7,7 +7,7 @@
         "author": "BeamUp",
         "manufacturer": "BeamUp",
         "file_formats": "text/x-gcode",
-        "platform": "beamup_s.stl",
+        "platform": "beamup_s.3mf",
         "platform_offset": [0, -5, -10],
         "has_machine_quality": true,
         "has_materials": true,

resources/definitions/bq_hephestos.def.json

@@ -7,7 +7,7 @@
         "author": "BQ",
         "manufacturer": "BQ",
         "file_formats": "text/x-gcode",
-        "platform": "bq_hephestos_platform.stl",
+        "platform": "bq_hephestos_platform.3mf",
         "platform_offset": [ 0, -82, 0],
         "machine_extruder_trains":
         {

resources/definitions/bq_hephestos_2.def.json

@@ -6,7 +6,7 @@
         "visible": true,
         "author": "BQ",
         "manufacturer": "BQ",
-        "platform": "bq_hephestos_2_platform.stl",
+        "platform": "bq_hephestos_2_platform.3mf",
         "platform_offset": [6, 1320, 0 ],
         "file_formats": "text/x-gcode",
         "machine_extruder_trains":