AutoTest: Code cosmetics

* use nullptr
* override
* remove old style casts
* fix most of the code model warnings

Change-Id: Ia08e846f9326ae28ca7e7d66748e25a8b817b9b1
Reviewed-by: Xing Xiong
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/autotest/testconfiguration.cpp

@@ -48,10 +48,6 @@ using namespace ProjectExplorer;
 namespace Autotest {
 namespace Internal {
 
-TestConfiguration::TestConfiguration()
-{
-}
-
 TestConfiguration::~TestConfiguration()
 {
     m_testCases.clear();