Move all sources to subdirs

src/util/addr_util.h

@@ -0,0 +1,10 @@
+#pragma once
+
+#include <sys/socket.h>
+#include <string>
+#include <vector>
+
+bool string_to_addr(std::string str, bool parse_port, int default_port, struct sockaddr_storage *addr);
+std::string addr_to_string(const sockaddr_storage &addr);
+std::vector<std::string> getifaddr_list(std::vector<std::string> mask_cfg = std::vector<std::string>(), bool include_v6 = false);
+int create_and_bind_socket(std::string bind_address, int bind_port, int listen_backlog, int *listening_port);