Added visibility meta data

CURA-1278

resources/definitions/bq_hephestos.def.json

@@ -4,6 +4,7 @@
     "version": 2,
     "inherits": "fdmprinter",
     "metadata": {
+        "visible": true,
         "author": "BQ",
         "manufacturer": "BQ",
         "category": "Other",

resources/definitions/bq_hephestos_2.def.json

@@ -4,6 +4,7 @@
     "name": "BQ Hephestos 2",
     "inherits": "fdmprinter",
     "metadata": {
+        "visible": true,
         "author": "BQ",
         "manufacturer": "BQ",
         "category": "Other",

resources/definitions/bq_hephestos_xl.def.json

@@ -4,6 +4,7 @@
     "name": "BQ Prusa i3 Hephestos XL",
     "inherits": "fdmprinter",
     "metadata": {
+        "visible": true,
         "manufacturer": "BQ",
         "author": "BQ",
         "category": "Other",

resources/definitions/bq_witbox.def.json

@@ -4,6 +4,7 @@
     "name": "BQ Witbox",
     "inherits": "fdmprinter",
     "metadata": {
+        "visible": true,
         "author": "BQ",
         "manufacturer": "BQ",
         "category": "Other",

resources/definitions/bq_witbox_2.def.json

@@ -4,6 +4,7 @@
     "name": "BQ Witbox 2",
     "inherits": "fdmprinter",
     "metadata": {
+        "visible": true,
         "author": "BQ",
         "manufacturer": "BQ",
         "category": "Other",

resources/definitions/grr_neo.def.json

@@ -4,6 +4,7 @@
     "name": "German RepRap Neo",
     "inherits": "fdmprinter",
     "metadata": {
+        "visible": true,
         "author": "Simon Cor",
         "manufacturer": "German RepRap",
         "category": "Other",

resources/definitions/innovo_inventor.def.json

@@ -4,6 +4,7 @@
     "name": "Innovo INVENTOR",
     "inherits": "fdmprinter",
     "metadata": {
+        "visible": true,
         "author": "Adam Rumjahn",
         "manufacturer": "Innovo",
         "category": "Other",

resources/definitions/m180.def.json

@@ -4,6 +4,7 @@
     "name": "Malyan M180",
     "inherits": "fdmprinter",
     "metadata": {
+        "visible": true,
         "author": "Ruben Dulek",
         "manufacturer": "Malyan",
         "category": "Other",

resources/definitions/maker_starter.def.json

@@ -4,6 +4,7 @@
     "name": "3DMaker Starter",
     "inherits": "fdmprinter",
     "metadata": {
+        "visible": true,
         "author": "tvlgiao",
         "manufacturer": "3DMaker",
         "file_formats": "text/x-gcode;application/x-stl-ascii;application/x-stl-binary;application/x-wavefront-obj",

resources/definitions/prusa_i3.def.json

@@ -4,6 +4,7 @@
     "name": "Prusa i3",
     "inherits": "fdmprinter",
     "metadata": {
+        "visible": true,
         "author": "Quillford",
         "manufacturer": "Prusajr",
         "category": "Other",