Partially decouple local CMakeRunConfiguration from CMakeProject

Funnel all relevant data through target.applicationTargets() as
done for the non-local CMake-supporting setups and QBS already.

There is cleanup potential left for later changes.

Change-Id: I49ed6abd98c058a7fd1545e41b3bcd6ecb758a8b
Task-number: QTCREATORBUG-19985
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/plugins/pythoneditor/pythoneditorplugin.cpp

@@ -204,7 +204,7 @@ void PythonRunConfiguration::doAdditionalSetup(const RunConfigurationCreationInf
     Environment sysEnv = Environment::systemEnvironment();
     const QString exec = sysEnv.searchInPath("python").toString();
     m_interpreter = exec.isEmpty() ? "python" : exec;
-    m_mainScript = info.extra;
+    m_mainScript = info.targetName;
     setDefaultDisplayName(defaultDisplayName());
 }