refactored EntityClass usage to only store being a miscmodel in miscmodel_is bool + set it on setting classname

* miscmodel filter: simplify and support miscmodels, defined by new way (xml .ent)

radiant/eclass_def.cpp

@@ -204,7 +204,7 @@ EntityClass *Eclass_InitFromText( const char *text ){
 
 	// grab the name
 	text = COM_Parse( text );
-	e->m_name = Get_COM_Token();
+	e->name_set( Get_COM_Token() );
 	debugname = e->name();
 
 	{