Add proper monochrome icons

Currently not used in many places, but hopefully in Android/Chrome in the near future. I will also use to make icons for t he google play version soon as it is actually supported there

manifest.json

@@ -5,37 +5,61 @@
     {
       "src": "maskable-icon-adaptive.svg",
       "type": "image/svg+xml",
-      "purpose": "maskable monochrome",
+      "purpose": "maskable",
       "sizes": "512x512"
     },
     {
       "src": "maskable-icon-512.png",
       "type": "image/png",
-      "purpose": "maskable monochrome",
+      "purpose": "maskable",
       "sizes": "512x512"
     },
     {
       "src": "maskable-icon-192.png",
-      "purpose": "maskable monochrome",
       "type": "image/png",
+      "purpose": "maskable",
       "sizes": "192x192"
     },
     {
       "src": "icon-adaptive.svg",
       "type": "image/svg+xml",
-      "purpose": "any monochrome",
+      "purpose": "any",
       "sizes": "512x512"
     },
     {
       "src": "icon-512.png",
       "type": "image/png",
-      "purpose": "any monochrome",
+      "purpose": "any",
       "sizes": "512x512"
     },
     {
       "src": "icon-192.png",
+      "type": "image/png",
+      "purpose": "any",
+      "sizes": "192x192"
+    },
+    {
+      "src": "maskable-monochrome-icon-512.png",
+      "type": "image/png",
+      "purpose": "maskable monochrome",
+      "sizes": "512x512"
+    },
+    {
+      "src": "maskable-monochrome-icon-192.png",
+      "type": "image/png",
+      "purpose": "maskable monochrome",
+      "sizes": "192x192"
+    },
+    {
+      "src": "monochrome-icon-512.png",
+      "type": "image/png",
       "purpose": "any monochrome",
+      "sizes": "512x512"
+    },
+    {
+      "src": "monochrome-icon-192.png",
       "type": "image/png",
+      "purpose": "any monochrome",
       "sizes": "192x192"
     }
   ],