Add Snell protocol. Refactor MASQUE HTTP/2, Fair Queue. Update XHTTP, OpenVPN, Sudoku, Fallback. Fixes

examples/snell/server.json

@@ -0,0 +1,39 @@
+{
+  "log": {
+    "level": "error"
+  },
+  "dns": {
+    "servers": [
+      {
+        "type": "local",
+        "tag": "default"
+      }
+    ]
+  },
+  "inbounds": [
+    {
+      "type": "snell",
+      "tag": "snell-in",
+      "listen": "::",
+      "listen_port": 8443,
+      "psk": "your-secret-psk",
+      "version": 4, // 4 | 5 (server supports v4/v5 only)
+      "network": ["tcp", "udp"]
+      // "obfs": {
+      //   "mode": "tls", // tls | http
+      //   "host": "bing.com"
+      // }
+    }
+  ],
+  "outbounds": [
+    {
+      "type": "direct",
+      "tag": "direct"
+    }
+  ],
+  "route": {
+    "final": "direct",
+    "default_domain_resolver": "default",
+    "auto_detect_interface": true
+  }
+}