some refactoring

* massive changes inside includes, drop unused definitions
* rewrite some initialization methods to avoid additional
freeing/allocation
* drop some explicit destructors calls

sources/awesomewidgets/qcronscheduler.cpp

@@ -44,7 +44,6 @@ QCronScheduler::~QCronScheduler()
     qCDebug(LOG_LIB) << __PRETTY_FUNCTION__;
 
     m_timer->stop();
-    delete m_timer;
 }