a simple server for kcp
port: udp port for listen
keep_session_time: keep alive time for one session
package_recv_cb_func: when package received, callback this func
session_kick_cb_func: when session kick by system, callback this func
error_log_reporter call this func when need report some error log
KCPServer server;
server.Start();
while(true) {
isleep(1);
server.Update();
}