enable-cors extension added

configs/monero-block-explorer.json

@@ -1,7 +1,8 @@
 {
   "extensions": [
     "core/monero.json",
-    "blockchain-explorer.json"
+    "blockchain-explorer.json",
+    "enable-cors.json"
   ],
   "base_coin": {
     "name": "monero",

extensions/enable-cors.json

@@ -0,0 +1,23 @@
+{
+  "file": "enable-cors.json",
+  "description": "Adds CORS support",
+  "required": [
+    "core/monero.json"
+  ],
+  "files": [
+    {
+      "path": "/contrib/epee/include/net/http_server_handlers_map2.h",
+      "changes": [
+        {
+          "action": "add_above",
+          "marker": "response.m_response_comment = \"Ok\"; \\",
+          "parameters": {
+            "text": [
+              "  response.m_additional_fields.push_back(std::make_pair(\"Access-Control-Allow-Origin\", \"*\")); "
+            ]
+          }
+        }
+      ]
+    }
+  ]
+}