Add version 1.19.3 (atlas generator, feature flags)

Fixes #304

src/config.json

@@ -83,6 +83,11 @@
     },
     {
       "id": "1.19",
+      "ref": "1.19.2",
+      "pack_format": 10
+    },
+    {
+      "id": "1.19.3",
       "dynamic": true,
       "pack_format": 10
     }
@@ -331,6 +336,14 @@
       "schema": "font",
       "minVersion": "1.16"
     },
+    {
+      "id": "atlas",
+      "url": "assets/atlas",
+      "path": "atlases",
+      "tags": ["assets"],
+      "schema": "atlas",
+      "minVersion": "1.19.3"
+    },
     {
       "id": "block_growth",
       "url": "partners/immersive-weathering/block-growth",