Added handler to add support for CGI scripts.

Added a new tool `httpd` which is a basic httpd server product (with file server and CGI handler).

tools/httpd/server.ini

@@ -0,0 +1,9 @@
+verbose=true
+verbose_level=ALERT
+port=9090
+#max_concurrent_connections=100
+#keep_alive_timeout=5
+#max_keep_alive_requests=300
+#max_tcp_clients=100
+#socket_timeout=60
+#socket_recv_timeout=15