some refactoring

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

sources/awesome-widget/plugin/awabstractpairconfig.cpp

@@ -56,7 +56,6 @@ AWAbstractPairConfig::~AWAbstractPairConfig()
 
     clearSelectors();
 
-    delete m_helper;
     delete ui;
 }