First commit with a basic mockserver for BeamNG stuff

mockserver/server.go

@@ -0,0 +1,20 @@
+package mockserver
+
+import (
+	"fmt"
+	"net"
+)
+
+func openUDPServer(addr string, port int) (*net.UDPAddr, *net.UDPConn, error) {
+	udpAddr, err := net.ResolveUDPAddr("udp", fmt.Sprintf("%s:%d", addr, port))
+	if err != nil {
+		return nil, nil, err
+	}
+
+	conn, err := net.ListenUDP("udp", nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	return udpAddr, conn, nil
+}