Added advanced settings for standalone connector

- max_concurrent_connections=100
- keep_alive_timeout=15
- max_tcp_clients=100
- socket_timeout=300
- max_keep_alive_requests=300
And then can be set via the options as well, and via .ini file.
Also improved the verbose console output system.

examples/simple/simple.ini

@@ -0,0 +1,8 @@
+verbose=true
+verbose_level=ALERT
+port=9090
+#max_concurrent_connections=100
+#keep_alive_timeout=15
+#max_tcp_clients=100
+#socket_timeout=300
+#max_keep_alive_requests=300