增加HTTP解析层目录结构，增加插件自注册功能。

* 增加HTTP解析层目录结构，集成CMakeLists.txt编译文件；
* 调整编译顺序，先编译插件再编译平台；
* 增加TFE_PLUGIN_REGISTER宏，在TFE启动时自注册插件；
* 修改了stream_open接口，在插件流初始化接口不传入数据。

common/include/tfe_plugin.h

@@ -0,0 +1,57 @@
+#pragma once
+
+#include <tfe_stream.h>
+
+struct tfe_proxy;
+struct tfe_thread_ctx;
+
+typedef int plugin_init_cb_t(struct tfe_proxy * proxy);
+typedef void plugin_deinit_cb_t(struct tfe_proxy * proxy);
+
+//Return 1 for identify as its traffic;
+//Return 0 for unknown traffic;
+typedef int stream_open_cb_t(const struct tfe_stream * stream, unsigned int thread_id,
+	enum tfe_conn_dir dir, void ** pme);
+
+typedef tfe_stream_action stream_data_cb_t(const struct tfe_stream * stream, unsigned int thread_id,
+	enum tfe_conn_dir dir, const unsigned char * data, size_t len, void ** pme);
+
+typedef void stream_close_cb_t(const struct tfe_stream * stream, unsigned int thread_id,
+	enum tfe_stream_close_reason reason, void ** pme);
+
+enum tfe_plugin_type
+{
+	TFE_PLUGIN_TYPE_PLATFORM,
+	TFE_PLUGIN_TYPE_PROTOCOL,
+	TFE_PLUGIN_TYPE_BUSINESS
+};
+
+struct tfe_plugin
+{
+	/* SYMBOL & PROTOCOL */
+	const char * symbol;
+	enum tfe_plugin_type type;
+	enum tfe_app_proto proto;
+
+	/* PLUGIN INIT & DEINIT */
+	plugin_init_cb_t * on_init;
+	plugin_deinit_cb_t * on_deinit;
+
+	/* PLUGIN STREAM ENTRIES */
+	stream_open_cb_t * on_open;
+	stream_data_cb_t * on_data;
+	stream_close_cb_t * on_close;
+};
+
+/* Register plugin */
+int tfe_plugin_register(struct tfe_plugin * plugin);
+/* Unregister plugin */
+void tfe_plugin_unregister(struct tfe_plugin * plugin);
+
+#define TFE_PLUGIN_REGISTER(_symbol, _plugin)											\
+static void __attribute__((constructor, used)) __plugin_loader_##_symbol();				\
+static void __plugin_loader_##_symbol()													\
+{																						\
+	_plugin.symbol = #_symbol;															\
+	tfe_plugin_register(&_plugin);														\
+}