完成HTTP请求侧解析调试，可以解析请求的URL。

* 增加插件管理功能（简单实现），可以调用解析层插件；
* 调整HTTP请求侧解析回调函数实现；
* 增加hexdump工具函数；

common/src/tfe_plugin.cpp

@@ -0,0 +1,30 @@
+
+#include <tfe_plugin.h>
+
+#ifndef TFE_PLUGIN_MAX
+#define TFE_PLUGIN_MAX		128
+#endif
+
+static struct tfe_plugin * __g_tfe_plugin_info[TFE_PLUGIN_MAX];
+static unsigned int __g_nr_plugin_info = 0;
+
+void tfe_plugin_register(struct tfe_plugin * plugin)
+{
+	__g_tfe_plugin_info[__g_nr_plugin_info++] = plugin;
+}
+
+void tfe_plugin_unregister(struct tfe_plugin * plugin)
+{
+	return;
+}
+
+struct tfe_plugin * tfe_plugin_iterate(unsigned int * iterate)
+{
+	if (*iterate < __g_nr_plugin_info) return __g_tfe_plugin_info[(*iterate)++];
+	else return NULL;
+}
+
+unsigned int tfe_plugin_total_counts()
+{
+	return __g_nr_plugin_info;
+}