Moving start messages to lua

Moved start log messages to lua, to make easier to enable/disable those
messages.

src/framework/core/application.cpp

@@ -153,7 +153,6 @@ void Application::poll()
 void Application::exit()
 {
     m_stopping = true;
-    g_logger.info("Exiting application..");
 }
 
 void Application::close()

src/framework/core/logger.cpp

@@ -129,7 +129,5 @@ void Logger::setLogFile(const std::string& file)
         g_logger.error(stdext::format("Unable to save log to '%s'", file));
         return;
     }
-
-    m_outFile << "\n== application started at " << stdext::date_time_string() << std::endl;
     m_outFile.flush();
 }