Added mg_wakeup_server_ex(), removed mg_wakeup_server() and mg_iterate_over_connections()

docs/API.md

@@ -136,23 +136,14 @@ given parameter name is not valid, NULL is returned. For valid names, return
 value is guaranteed to be non-NULL. If parameter is not set, zero-length string
 is returned.
 
-
-    void mg_iterate_over_connections(struct mg_server *, mg_handler_t func);
-
-This is an interface primarily designed to push arbitrary data to websocket
-connections at any time. This function could be called from the Mongoose thread
-only.  When it returns, Mongoose thread calls `func()` for each active
-connection.
-It is allowed to call `mg_send_data()` or `mg_websocket_write()` within a
-callback, cause `func` is executed in the context of the Mongoose thread.
-
-    void mg_wakeup_server(struct mg_server *);
-
-Makes `mg_poll_server()` that could be sleeping in the `select()` syscall
-to break the call and return. This function can be called from any thread.
-It is designed to let other threads wake up Mongoose thread from the sleep
-and let it do a fresh new IO iteration over all connection. Usually it is done
-when other threads decides there is new data ready to be sent by Mongoose.
+    void mg_wakeup_server_ex(struct mg_server *, mg_handler_t func,
+                             const char *fmt, ...);
+
+Sends string message to a server. Function `func` is called for every active
+connection. String message is passed in `struct mg_connection::callback_param`.
+This function is designed to push data to the connected clients, and
+can be called from any thread. There is a limitation on the length of
+the message, currently at 8 kilobytes.
 
     void mg_send_status(struct mg_connection *, int status_code);
     void mg_send_header(struct mg_connection *, const char *name,