added: plugin mechanism

files: core/plugin.h core/plugin.cpp core/pluginmsg.h
added: directory 'main' with main.cpp (moved from 'core' directory)
changed: the way of building
       nearly everything is in cmslu.so
       only main() is in cmslu and is dynamically linked with cmslu.so



git-svn-id: svn://ttmath.org/publicrep/cmslu/trunk@516 e52654a7-88a9-db11-a3e9-0013d4bc506e

core/data.h

@@ -86,6 +86,9 @@ public:
 	int session_max_iddle;
 
 	bool compression;
+	
+	// plugins
+	std::vector<std::string> plugin_file;
 
 	// end config members
 	// -----------------------------------------------------------------