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/functionparser.h

@@ -12,9 +12,6 @@
 
 #include "requesttypes.h"
 
-#ifdef APPFUNCTIONS	
-#include "../app/content.h"
-#endif
 
 class FunctionParser
 {