new: syn.scan will now perform basic tcp banner grabbing

modules/syn_scan/tcp_grabber.go

@@ -0,0 +1,18 @@
+package syn_scan
+
+import (
+	"bufio"
+	"fmt"
+	"net"
+	"strings"
+)
+
+func tcpGrabber(mod *SynScanner, ip string, port int) string {
+	if conn, err := net.Dial("tcp", fmt.Sprintf("%s:%d", ip, port)); err == nil {
+		defer conn.Close()
+		msg, _ := bufio.NewReader(conn).ReadString('\n')
+		return strings.Trim(msg, "\r\n\t ")
+	}
+
+	return ""
+}