CMakePM: Start integrating ctest

Gather some more information of a CMake based project to be
able to provide this later on to the AutoTest plugin.

Task-number: QTCREATORBUG-23332
Change-Id: I2beaf0a6456d57871dcf65832f0a79f37fe5fddc
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/cmakeprojectmanager/fileapiparser.h

@@ -57,6 +57,7 @@ class ReplyFileContents
 public:
     QString generator;
     QString cmakeExecutable;
+    QString ctestExecutable;
     QString cmakeRoot;
 
     QVector<ReplyObject> replies;