Add websocket module.

Webassembly is client-only for obvious reasons.
Other platforms support both client and server using libwebsockets.

modules/websocket/websocket_macros.h

@@ -0,0 +1,62 @@
+/*************************************************************************/
+/*  websocket_macros.h                                                   */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                      GODOT WEBSOCKET MODULE                           */
+/*            https://github.com/LudiDorici/godot-websocket              */
+/*************************************************************************/
+/* Copyright (c) 2017 Ludi Dorici, di Alessandrelli Fabio                */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+#ifndef WEBSOCKETMACTOS_H
+#define WEBSOCKETMACTOS_H
+
+/* clang-format off */
+#define GDCICLASS(CNAME) \
+public:\
+	static CNAME *(*_create)();\
+\
+	static Ref<CNAME > create_ref() {\
+\
+		if (!_create)\
+			return Ref<CNAME >();\
+		return Ref<CNAME >(_create());\
+	}\
+\
+	static CNAME *create() {\
+\
+		if (!_create)\
+			return NULL;\
+		return _create();\
+	}\
+protected:\
+
+#define GDCINULL(CNAME) \
+CNAME *(*CNAME::_create)() = NULL;
+
+#define GDCIIMPL(IMPNAME, CNAME) \
+public:\
+	static CNAME *_create() { return memnew(IMPNAME); }\
+	static void make_default() { CNAME::_create = IMPNAME::_create; }\
+protected:\
+/* clang-format on */
+
+#endif // WEBSOCKETMACTOS_H