some refactoring

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

sources/test/testawkeys.cpp

@@ -168,9 +168,6 @@ void TestAWKeys::test_valueByKey()
 
 void TestAWKeys::test_dbus()
 {
-    if (!plugin->isDBusActive())
-        QSKIP("No DBus session created, skip DBus test");
-
     // get id
     qlonglong id = reinterpret_cast<qlonglong>(plugin);