Generate NetworkSettings with IPC

This generates and applies NetworkSettings object with unix socket IPC.

- domain socket, json-rpc based communication
- switches to anyhow for burrow crate
- adds support for starting daemons on macos

Apple/NetworkExtension/NetworkExtension-macOS.entitlements

@@ -2,6 +2,8 @@
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
+	<key>com.apple.security.network.client</key>
+	<true/>
 	<key>com.apple.developer.networking.networkextension</key>
 	<array>
 		<string>packet-tunnel-provider</string>